M1 Arm silicon is currently unsupported and from being here a while, people have tried various ways to “fudge” it working but nothing seems to work without some sort of problem - essentially making it unplayable even if it will launch. Getting it running like you have (even with the graphical issues) is probably the most successful anyone has been.
Out of interest, did you get the Linux version of LE working via crossover on the M1 pro? (Linux version is downloadable via the account page on the EHG website). Or is it the Windows version you have attempted to get working?
Offical notice re M1 support.