I don't use tablets so I can't say with experience, but in Windows with PCs and laptops, the default way to manoeuvre around a screen or an application window is using TAB and then Enter.
Make your selection, then TAB to the Apply button even if you cannot see it, then press Enter.
Mark
Hello
. I have a problem. Yesterday I just purchased a new tablet (Impera I
. It has WIndows 8,1 on it. I wanted to make all the items bigger(Change the size of all items)(Personalize>Display) and I set the size to 300%. I realised it was too small, and when I wanted to change it back I couldn.t The screen is too small and there's no "apply" button. I can only select the size but not apply it. Is there any way to change it back?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic