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From inbox to Archive, it seems I have to open them one by one and archive one by one.Select all for what? What are you trying to do? If your trying to delete the inbox no there is not but spam n trash you can empty box.
Ok so this worked on mine I selected what I wanted to archive then at the top there is a folder icon with an arrow on it and that archived them all. The icon is to the left of the trashcan
Quite agree it is silly as the Select All is on desktop.I've been crying about it for a few years. Gmail refuses to put a select all option. That's why I use K-9