Thanks for your reply. Here is more information.
There were three setups, all for the purposes of astronomy.
The first was on a platform called
Astroberry, an adaptation of Linux (sorry, don't remember which distro it was based on but it was ARM) running on a Raspberry Pi4.
The second was on a platform called
AstroArch, an adaptation of ArchLinux, for ARM platform, running on both a Raspberry Pi4 and Pi5.
In both of these, there was no screen size issue.
The third was on a hardware device called
Stellarmate Pro, which is somehow based on Raspberry Pi inside, running a version of Linux called
Stellarmate OS. Stellarmate OS is also available for sale to users who already own a Raspberry Pi, but I bought the device because of better hardware reliability. However, it does exhibit the screen size problem.