The registry settings, provided at the link below, will switch the default Explorer to the classic, Windows 10 version:
https://www.elevenforum.com/t/restore-classic-file-explorer-with-ribbon-in-windows-11.620/#Three
My free, open source (i.e. NOT shady) SwitchExplorer app applies exactly the same registry entries for you (and provides the option to switch the context menu as well). It's just an easier way to get the same thing done:
https://lesferch.github.io/SwitchExplorer/
Please note that with the above methods, the Details pane (i.e. the place you can edit file properties, not the Details view) will still be the new crippled version. To get the classic, more powerful Details pane, you can use my other free, open source (i.e. NOT shady) tool to launch Explorer: