select different chart scale Kola map disappears from MFD at 75nm zoom

[Glide]

When you zoom out with the Kola map on the MFD, the terrain disappears at 75nm.

 

[Raptor9]

Some chart scales are intended for specific TSD scale settings. The same thing happens when you zoom in too far, you might loose the chart underlay. But you can manually assign different chart scales for a given TSD scale on the MAP sub-page and pressing the SCALE button at L3.

[Zarma]

Same on many other maps and/or planes