Maple makes use of shortcut keys as an alternative to some menu selections.
To change the worksheet display zoom factor:
50 % is [ctrl]+0
75 % is [ctrl]+1
100 % is [ctrl]+2
125 % is [ctrl]+3
150 % is [ctrl]+4
200 % is [ctrl]+5
300 % is [ctrl]+6
400 % is [ctrl]+7
Note that the zoom affects only the worksheet portion and not the menus or palettes.
Help pages:
Open Maple Help sytem is [ctrl]+F1
Quick Refernce page is [ctrl]+F2
Quick Help is F1
Toggle between Math and Text is F5
Open a file is [ctrl]+o
Create a new Maple document page is [ctrl]+n