Use Microsoft PowerToys and the utility Always On Top which can be used to toggle Always On Top mode 👍

From the doc:

PowerToys Always On Top is a system-wide Windows utility that allows you to pin windows above other windows. This utility helps you keep important windows visible at all times, improving your productivity by ensuring critical information stays accessible while you work with other applications.

When you activate Always On Top (default: ⊞ Win+Ctrl+T), the utility pins the active window above all other windows. The pinned window stays on top, even when you select other windows.

The tool has loads of useful things, but could disable every other part of it if you want.