Setting the default resolution to use when a new screen is connected in Linux Mint?

I use a Dell XPS 13 laptop with a 4k screen. I only ever use in FHD resolution. Whenever I connect an external screen that I've not used before (this happens surprisingly often), Mint autodetects the new screen, sets it to FHD (good), but sets the built-in screen to 4k (bad) with a user interface scale of 200% (also bad), so I have to access display settings, switch to FHD and do resize many open windows. Not the end of the world, but tedious. Is there a way to tell Mint which resolution and scale to use by default on my built-in screen, i.e. to retain FHD and 100% scale on the built-in display, regardless of the kind of external display I connect? For context: $ inxi -GSC System: Host: ******* Kernel: 6.8.0-51-generic arch: x86_64 bits: 64 Desktop: Cinnamon v: 6.2.9 Distro: Linux Mint 22 Wilma CPU: Info: quad core model: Intel Core i7-8550U bits: 64 type: MT MCP cache: L2: 1024 KiB Speed (MHz): avg: 2000 min/max: 400/4000 cores: 1: 1998 2: 2000 3: 2001 4: 2001 5: 2000 6: 2000 7: 2000 8: 2000 Graphics: Device-1: Intel UHD Graphics 620 driver: i915 v: kernel Device-2: Realtek Integrated_Webcam_HD driver: uvcvideo type: USB Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X: loaded: modesetting unloaded: fbdev,vesa dri: iris gpu: i915 resolution: 1: 1920x1080~60Hz 2: 1920x1080~60Hz API: EGL v: 1.5 drivers: iris,swrast platforms: x11,surfaceless,device API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 24.0.9-0ubuntu0.3 renderer: Mesa Intel UHD Graphics 620 (KBL GT2)