Keyboard shortcuts

All the shortcuts use the ALT key modifier.

ALT-O

Optimize

ALT-P

Compact ( Pack )

ALT-R

Reorganize

ALT-C

Crop Canvas

ALT-X

Center bloc X

ALT-Y

Center bloc Y

ALT +

Zoom In

ALT -

Zoom Out

for quick fix it is possible to draw a background color pixel,
press the SHIFT key to draw the pixel cursor
then press the CONTROL key to draw the pixel.