The View Menu

View → Zoom In (Ctrl++)

Increases the magnification by 20 %.

View → Zoom Out (Ctrl+-)

Decreases the magnification by 20 %.

View → Zoom

Here the magnification factor of the graphical presentation can be set.

View → Refresh (F5)

By this the current data or plot file will be reloaded and presented.

View → Reload periodically

Here periodically refreshing of the presentation of plot or data files may be activated. Also the time interval may be set.