I use Logitech K400 Plus Wireless Touch TV Keyboard meaning not really a Mac keyboard. Here is my Mac version:
ozkan@ozkans-Mac-mini ~ % sw_vers
ProductName: macOS
ProductVersion: 26.1
BuildVersion: 25B78
I downloaded IntelliJ, and I was using it as usual. I saw that Ctrl+Space is not working for auto-complete. I tried different combinations, but nothing worked, then I opened the keymap settings
And as seen at the bottom, it has many conflicts.
Find Action…, Basic, Minimize, and 19 more shortcuts conflict with the macOS system shortcuts.
Assign custom shortcuts or change the macOS system settings.
I tried different macOS keymaps from the dropdown list on top, but nothing worked properly, especially auto-complete is not working; this was unexpected. I know it suggests changing the system configuration. I am not very familiar with macOS. I wonder what is the best practice?

I tried different macOS keymaps from the dropdownand linked article is saying disable the system default shortcuts, I was hoping someone else may use windows keyboard with intellij and have a workaround maybe.