diff --git a/samples/bluetooth/central_and_peripheral_hr/boards/nrf54l15dk_nrf54l15_cpuapp.conf b/samples/bluetooth/central_and_peripheral_hr/boards/nrf54l15dk_nrf54l15_cpuapp.conf
deleted file mode 100644
index 06c0f94b6568..000000000000
--- a/samples/bluetooth/central_and_peripheral_hr/boards/nrf54l15dk_nrf54l15_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=3584
diff --git a/samples/bluetooth/central_and_peripheral_hr/prj.conf b/samples/bluetooth/central_and_peripheral_hr/prj.conf
index df8c2487680b..dbf14acc5645 100644
--- a/samples/bluetooth/central_and_peripheral_hr/prj.conf
+++ b/samples/bluetooth/central_and_peripheral_hr/prj.conf
@@ -34,6 +34,5 @@ CONFIG_FLASH_MAP=y
 CONFIG_SETTINGS=y
 
 CONFIG_HEAP_MEM_POOL_SIZE=1024
-CONFIG_MAIN_STACK_SIZE=2048
 
 CONFIG_DK_LIBRARY=y
diff --git a/samples/bluetooth/central_bas/prj.conf b/samples/bluetooth/central_bas/prj.conf
index fb7ff8a6674e..3deae57b598a 100644
--- a/samples/bluetooth/central_bas/prj.conf
+++ b/samples/bluetooth/central_bas/prj.conf
@@ -24,5 +24,3 @@ CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_FLASH_MAP=y
 
 CONFIG_DK_LIBRARY=y
-
-CONFIG_MAIN_STACK_SIZE=2048
diff --git a/samples/bluetooth/peripheral_bms/boards/nrf54l15dk_nrf54l15_cpuapp.conf b/samples/bluetooth/peripheral_bms/boards/nrf54l15dk_nrf54l15_cpuapp.conf
deleted file mode 100644
index 06c0f94b6568..000000000000
--- a/samples/bluetooth/peripheral_bms/boards/nrf54l15dk_nrf54l15_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=3584
diff --git a/samples/bluetooth/peripheral_bms/prj.conf b/samples/bluetooth/peripheral_bms/prj.conf
index 24ffebaf386d..3be4aafc12b5 100644
--- a/samples/bluetooth/peripheral_bms/prj.conf
+++ b/samples/bluetooth/peripheral_bms/prj.conf
@@ -6,7 +6,6 @@
 CONFIG_NCS_SAMPLES_DEFAULTS=y
 CONFIG_DK_LIBRARY=y
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
-CONFIG_MAIN_STACK_SIZE=2048
 
 CONFIG_BT=y
 CONFIG_BT_PERIPHERAL=y
diff --git a/samples/bluetooth/peripheral_cgms/boards/nrf54l15dk_nrf54l15_cpuapp.conf b/samples/bluetooth/peripheral_cgms/boards/nrf54l15dk_nrf54l15_cpuapp.conf
deleted file mode 100644
index 06c0f94b6568..000000000000
--- a/samples/bluetooth/peripheral_cgms/boards/nrf54l15dk_nrf54l15_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=3584
diff --git a/samples/bluetooth/peripheral_cgms/prj.conf b/samples/bluetooth/peripheral_cgms/prj.conf
index 603427cb8ece..e7ca20ca3101 100644
--- a/samples/bluetooth/peripheral_cgms/prj.conf
+++ b/samples/bluetooth/peripheral_cgms/prj.conf
@@ -23,4 +23,3 @@ CONFIG_LOG=y
 CONFIG_BT_CGMS_LOG_LEVEL_INF=y
 CONFIG_SFLOAT=y
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1280
-CONFIG_MAIN_STACK_SIZE=2048
diff --git a/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l05_cpuapp.conf b/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l05_cpuapp.conf
deleted file mode 100644
index 5b453c66f15c..000000000000
--- a/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l05_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=4096
diff --git a/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l10_cpuapp.conf b/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l10_cpuapp.conf
deleted file mode 100644
index 5b453c66f15c..000000000000
--- a/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l10_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=4096
diff --git a/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l15_cpuapp.conf b/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l15_cpuapp.conf
deleted file mode 100644
index 5b453c66f15c..000000000000
--- a/samples/bluetooth/peripheral_lbs/boards/nrf54l15dk_nrf54l15_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=4096
diff --git a/samples/bluetooth/peripheral_lbs/prj.conf b/samples/bluetooth/peripheral_lbs/prj.conf
index 15c07354db51..63a681872413 100644
--- a/samples/bluetooth/peripheral_lbs/prj.conf
+++ b/samples/bluetooth/peripheral_lbs/prj.conf
@@ -15,4 +15,3 @@ CONFIG_BT_LBS_POLL_BUTTON=y
 CONFIG_DK_LIBRARY=y
 
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
-CONFIG_MAIN_STACK_SIZE=2048
diff --git a/samples/bluetooth/peripheral_status/boards/nrf54l15dk_nrf54l15_cpuapp.conf b/samples/bluetooth/peripheral_status/boards/nrf54l15dk_nrf54l15_cpuapp.conf
deleted file mode 100644
index 06c0f94b6568..000000000000
--- a/samples/bluetooth/peripheral_status/boards/nrf54l15dk_nrf54l15_cpuapp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2025 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-CONFIG_MAIN_STACK_SIZE=3584
diff --git a/samples/bluetooth/peripheral_status/prj.conf b/samples/bluetooth/peripheral_status/prj.conf
index 2f7071373343..3602c3a22d43 100644
--- a/samples/bluetooth/peripheral_status/prj.conf
+++ b/samples/bluetooth/peripheral_status/prj.conf
@@ -14,4 +14,3 @@ CONFIG_BT_NSMS=y
 CONFIG_DK_LIBRARY=y
 
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
-CONFIG_MAIN_STACK_SIZE=2048