

I sounds like your window manager is telling the program to display with high-DPI scaling when it shouldn’t be. This is a common issue when running older software written for X11 on newer Linuxes that are using Wayland. fre:ac was originally written in 2001!
You might have a system display setting to control scaling of “legacy” (X11) applications. I know KDE Plasma does.
I left my heart in ?SYNTAX ERROR