Even in Word it’s not a good idea to use Tabs for indents. Better to have used Styles or at least paragraph formatting…
Be that as it may, I searched this forum and found the top hit from almost a decade ago. There might be more recent ones.
which explains how to find and replace tabs. Replace tabs as “nothing” and rely on your compile settings (or styles) to set the indents you want. I don’t use the Windows version to confirm that this still works, but I’m confident it does.