On my status bar the following items are (apparently intermittently) greyed out: Page At Ln REC TRK EXT OVR. 'Help' suggests switching to another document and/or moving the position of the cursor in the current document. Neither of these ploys has any effect. What now?
As others have said, all these can also be activated from elsewhere within Word.
Note: to use extended text put the cursor at the start of the text you want to select; double click EXT, move the cursor to the end of where you want to select the text; left mouse click. It can get a bit confusing when EXT is activated; blocks of text keep getting selected as you left mouse click. Try it, you’ll see what I mean!