There are few things to know here. The default Windows EFI partition of 100MB is too small for Windows and Elementary - Elementary will not be able to install on it. You need to create a second EFI ...
Looks like this is a regression due to a major re-write of the sidebar code. There is an issue report already here: https://github.com/elementary/files/issues/1781
There is a PR awaiting review and ...
I had a similar issue on a MacBook Air and used the instructions on AsK Ubuntu
sudo apt update
sudo apt install firmware-b43-installer
sudo apt install linux-firmware