NovaBACKUP PC/Server/BE v19.x (2019-04-02)
If you open the "Restore" tab the lower part of the window with the details of the backup contents is not displayed and looks similar to Figure 1:
Figure 1: Lower window with backup details is missing
Maximize NovaBACKUP window. Lower window area is visible (see yellow labeled area):
Figure 2: Maximized NovaBACKUP window shows missing area
Drag the horizontal line up (between red arrows in figure 2).
Restore the NovaBACKUP window to the size you desire.