If you see 7-Zip twice, you likely have both the 32-bit and 64-bit versions installed. Uninstall both and reinstall only the 64-bit version.
Windows 11 introduced a new (the one you see when you right-click a file/folder). By default, 7-Zip’s options are hidden inside the “Show more options” (Shift + F10) menu. windows 11 7zip context menu