View menu

zoom in

zooms to the next larger custom zoom factor (shortcut: Alt+o)

zoom out

zooms to the next smaller custom zoom factor (shortcut: Alt+i)

zoom 100

zooms to default 100%, used for newly generated empty tabs (shortcut: Alt+1)

fit network

zooms (in or out) to fit network into tab (shortcut: Alt+t)

fit all networks

collects coordinates from all tabs and applies common zooming to fit all networks into their tabs based on these coordinates

refresh

can be used to refresh the view manually (shortcut: Alt+r)

clear background

can be used to clear all background information (such as contour lines), that is not related directly to a single node or link