diff --git a/main/main.cpp b/main/main.cpp
index d476672f0ba..62d218477f2 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -121,6 +121,7 @@ static bool force_lowdpi = false;
 static int init_screen = -1;
 static bool use_vsync = true;
 static bool editor = false;
+static bool project_manager = false;
 static bool show_help = false;
 static bool disable_render_loop = false;
 static int fixed_fps = -1;
@@ -511,6 +512,9 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 		} else if (I->get() == "-e" || I->get() == "--editor") { // starts editor
 
 			editor = true;
+		} else if (I->get() == "-p" || I->get() == "--project-manager") { // starts project manager
+
+			project_manager = true;
 		} else if (I->get() == "--no-window") { // disable window creation, Windows only
 
 			OS::get_singleton()->set_no_window_mode(true);
@@ -788,8 +792,18 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 
 #ifdef TOOLS_ENABLED
 
-	if (main_args.size() == 0 && (!ProjectSettings::get_singleton()->has_setting("application/run/main_loop_type")) && (!ProjectSettings::get_singleton()->has_setting("application/run/main_scene") || String(ProjectSettings::get_singleton()->get("application/run/main_scene")) == ""))
+	if (!project_manager) {
+		// Determine if the project manager should be requested
+		project_manager =
+				main_args.size() == 0 &&
+				!ProjectSettings::get_singleton()->has_setting("application/run/main_loop_type") &&
+				(!ProjectSettings::get_singleton()->has_setting("application/run/main_scene") ||
+						String(ProjectSettings::get_singleton()->get("application/run/main_scene")) == "");
+	}
+
+	if (project_manager) {
 		use_custom_res = false; //project manager (run without arguments)
+	}
 
 #endif
 
@@ -839,9 +853,11 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	GLOBAL_DEF("rendering/quality/intended_usage/framebuffer_allocation", 2);
 	GLOBAL_DEF("rendering/quality/intended_usage/framebuffer_allocation.mobile", 3);
 
-	if (editor) {
-		OS::get_singleton()->_allow_hidpi = true; //editors always in hidpi
+	if (editor || project_manager) {
+		// The editor and project manager always detect and use hiDPI if needed
+		OS::get_singleton()->_allow_hidpi = true;
 	}
+
 	Engine::get_singleton()->_pixel_snap = GLOBAL_DEF("rendering/quality/2d/use_pixel_snap", false);
 	OS::get_singleton()->_keep_screen_on = GLOBAL_DEF("display/window/energy_saving/keep_screen_on", true);
 	if (rtm == -1) {
@@ -1194,7 +1210,6 @@ bool Main::start() {
 	String test;
 	String _export_preset;
 	bool export_debug = false;
-	bool project_manager_request = false;
 
 	List<String> args = OS::get_singleton()->get_cmdline_args();
 	for (int i = 0; i < args.size(); i++) {
@@ -1204,7 +1219,7 @@ bool Main::start() {
 		} else if (args[i] == "-e" || args[i] == "--editor") {
 			editor = true;
 		} else if (args[i] == "-p" || args[i] == "--project-manager") {
-			project_manager_request = true;
+			project_manager = true;
 		} else if (args[i].length() && args[i][0] != '-' && game_path == "") {
 			game_path = args[i];
 		}
@@ -1482,7 +1497,7 @@ bool Main::start() {
 		}
 
 		String local_game_path;
-		if (game_path != "" && !project_manager_request) {
+		if (game_path != "" && !project_manager) {
 
 			local_game_path = game_path.replace("\\", "/");
 
@@ -1527,7 +1542,7 @@ bool Main::start() {
 #endif
 		}
 
-		if (!project_manager_request && !editor) {
+		if (!project_manager && !editor) {
 			if (game_path != "" || script != "") {
 				//autoload
 				List<PropertyInfo> props;
@@ -1635,7 +1650,7 @@ bool Main::start() {
 		}
 
 #ifdef TOOLS_ENABLED
-		if (project_manager_request || (script == "" && test == "" && game_path == "" && !editor)) {
+		if (project_manager || (script == "" && test == "" && game_path == "" && !editor)) {
 
 			ProjectManager *pmanager = memnew(ProjectManager);
 			ProgressDialog *progress_dialog = memnew(ProgressDialog);