⌘+1 for 100%
⌘+2 for 75%
⌘+3 for 50%
OR
The options will only be there if your screen is not large enough to show the window at 100%.
⌘+2 for 75%
⌘+3 for 50%
OR
The options will only be there if your screen is not large enough to show the window at 100%.