diff --git a/src/others/sysmon/lv_sysmon.c b/src/others/sysmon/lv_sysmon.c
index caba080b6..8bf53e4ed 100644
--- a/src/others/sysmon/lv_sysmon.c
+++ b/src/others/sysmon/lv_sysmon.c
@@ -87,6 +87,7 @@ void _lv_sysmon_builtin_deinit(void)
 lv_obj_t * lv_sysmon_create(lv_display_t * disp)
 {
     LV_LOG_INFO("begin");
+    if(disp == NULL) disp = lv_display_get_default();
     lv_obj_t * label = lv_label_create(lv_display_get_layer_sys(disp));
     lv_obj_set_style_bg_opa(label, LV_OPA_50, 0);
     lv_obj_set_style_bg_color(label, lv_color_black(), 0);
@@ -100,6 +101,7 @@ lv_obj_t * lv_sysmon_create(lv_display_t * disp)
 
 void lv_sysmon_show_performance(lv_display_t * disp)
 {
+    if(disp == NULL) disp = lv_display_get_default();
     disp->perf_label = lv_sysmon_create(disp);
     lv_subject_init_pointer(&disp->perf_sysmon_backend.subject, &disp->perf_sysmon_info);
     lv_obj_align(disp->perf_label, LV_USE_PERF_MONITOR_POS, 0, 0);
@@ -116,6 +118,7 @@ void lv_sysmon_show_performance(lv_display_t * disp)
 
 void lv_sysmon_hide_performance(lv_display_t * disp)
 {
+    if(disp == NULL) disp = lv_display_get_default();
     lv_obj_add_flag(disp->perf_label, LV_OBJ_FLAG_HIDDEN);
 }
 
@@ -125,6 +128,7 @@ void lv_sysmon_hide_performance(lv_display_t * disp)
 
 void lv_sysmon_show_memory(lv_display_t * disp)
 {
+    if(disp == NULL) disp = lv_display_get_default();
     disp->mem_label = lv_sysmon_create(disp);
     lv_obj_align(disp->mem_label, LV_USE_MEM_MONITOR_POS, 0, 0);
     lv_subject_add_observer_obj(&sysmon_mem.subject, mem_observer_cb, disp->mem_label, NULL);
@@ -134,6 +138,7 @@ void lv_sysmon_show_memory(lv_display_t * disp)
 
 void lv_sysmon_hide_memory(lv_display_t * disp)
 {
+    if(disp == NULL) disp = lv_display_get_default();
     lv_obj_add_flag(disp->mem_label, LV_OBJ_FLAG_HIDDEN);
 }
 
diff --git a/src/others/sysmon/lv_sysmon.h b/src/others/sysmon/lv_sysmon.h
index 849a482e2..6db4c5943 100644
--- a/src/others/sysmon/lv_sysmon.h
+++ b/src/others/sysmon/lv_sysmon.h
@@ -89,13 +89,13 @@ lv_obj_t * lv_sysmon_create(lv_display_t * disp);
 
 /**
  * Show system performance monitor: CPU usage and FPS count
- * @param disp      target display, NULL for all displays
+ * @param disp      target display, NULL: use the default displays
  */
 void lv_sysmon_show_performance(lv_display_t * disp);
 
 /**
  * Hide system performance monitor
- * @param disp      target display, NULL for all displays
+ * @param disp      target display, NULL: use the default
  */
 void lv_sysmon_hide_performance(lv_display_t * disp);
 
@@ -105,13 +105,13 @@ void lv_sysmon_hide_performance(lv_display_t * disp);
 
 /**
  * Show system memory monitor: used memory and the memory fragmentation
- * @param disp      target display, NULL for all displays
+ * @param disp      target display, NULL: use the default displays
  */
 void lv_sysmon_show_memory(lv_display_t * disp);
 
 /**
  * Hide system memory monitor
- * @param disp      target display, NULL for all displays
+ * @param disp      target display, NULL: use the default displays
  */
 void lv_sysmon_hide_memory(lv_display_t * disp);
 
diff --git a/tests/src/lv_test_conf.h b/tests/src/lv_test_conf.h
index 91cd9c506..ccf087603 100644
--- a/tests/src/lv_test_conf.h
+++ b/tests/src/lv_test_conf.h
@@ -116,8 +116,6 @@ typedef void * lv_user_data_t;
 #define LV_DRAW_BUF_ALIGN                       852
 
 /*For screenshots*/
-#undef LV_USE_PERF_MONITOR
-#undef LV_USE_MEM_MONITOR
 #undef LV_DPI_DEF
 #define  LV_DPI_DEF         130
 #endif
diff --git a/tests/src/lv_test_conf_full.h b/tests/src/lv_test_conf_full.h
index d3d872905..90726f44a 100644
--- a/tests/src/lv_test_conf_full.h
+++ b/tests/src/lv_test_conf_full.h
@@ -73,6 +73,8 @@
 #define LV_USE_FILE_EXPLORER    1
 #define LV_USE_TINY_TTF         1
 #define LV_USE_SYSMON           1
+#define LV_USE_MEM_MONITOR      1
+#define LV_USE_PERF_MONITOR     1
 #define LV_USE_SNAPSHOT         1
 #define LV_USE_THORVG_INTERNAL  1
 #define LV_USE_LZ4_INTERNAL     1
diff --git a/tests/src/lv_test_init.c b/tests/src/lv_test_init.c
index 4d6f2f8b2..b01311e35 100644
--- a/tests/src/lv_test_init.c
+++ b/tests/src/lv_test_init.c
@@ -21,6 +21,8 @@ void lv_test_init(void)
 {
     lv_init();
     hal_init();
+    lv_sysmon_hide_memory(NULL);
+    lv_sysmon_hide_performance(NULL);
 }
 
 void lv_test_deinit(void)
diff --git a/tests/src/test_cases/widgets/test_arc.c b/tests/src/test_cases/widgets/test_arc.c
index 968ce89b3..5249ab551 100644
--- a/tests/src/test_cases/widgets/test_arc.c
+++ b/tests/src/test_cases/widgets/test_arc.c
@@ -182,7 +182,7 @@ void test_arc_click_sustained_from_start_to_end_does_not_set_value_to_max(void)
     lv_test_mouse_release();
     lv_test_indev_wait(50);
 
-    TEST_ASSERT_EQUAL_UINT32(1, event_cnt);
+    TEST_ASSERT_EQUAL_UINT32(0, event_cnt);
     TEST_ASSERT_EQUAL_INT32(lv_arc_get_min_value(arc), lv_arc_get_value(arc));
 
     /* Click close to end angle */