So Joe is between a rock and a hard place.
Z17.1 Core with kernel 6.5 and he has no wifi,
Z17.1 Core kernel 5.15 he has wifi but choppy windows.
But Joe is looking to stick with that old kernel as preferred boot, hence Storm's post and link to "[HOW TO] set an older kernel to default boot."
I am a bit puzzled as 5.15 kernel relates to Z16.
@Joe100 Did you upgrade Z16 to Z17.1 or did the update from Z17 to Z17.1 coming with kernel 6.5 cause the issue?
If I read correct, Z17 Core was first released with kernel 6.2 (I think).
EDIT: Yes was initially 6.2, see this: Use of kernel 6.2 in zorin 17 - security hazard? - #9 by AZorin
Did you ever experience the 6.2 kernel on Z17?