I notice in the manual that font size can be adjusted on other devices, but this is not enabled for PC and my font size has suddenly got smaller for no apparent reason. While the map scales up or down, the font remains the same size so this feature would be really handy on the PC version - right now my font is frustratingly small - both the menus and the map labels.
Any way I can do this while we wait (hopefully) for the SD team to enable font size change on PC?

Can you post a screenshot?

So as you can see (or maybe not!), the font for the the menu headings, ie "Route" "Mapping" "Go Flying" etc are pretty darned small and not alterable. Likewise the text on the map itself (names of towns and waypoints etc). This is using Windows 8 on a laptop. I tried "Appearance and Personalisation > Display > Change the text size only" which works for everything except the SD planner, so it seems this is something I can do only if SD itself has a feature to allow it. It is a bit of a puzzler as the font seems to have shrunk a couple of points all by itself one day. It may have happened when the version was updated or quite possibly I just became aware of it when I used the Windows settings to increase font size in my browsers and thus became aware that this does not have any effect on SD.

Sorry, I really do not have a solution for you here. The fact menus are also too small indicates that font sizing in general has changed on your computer, and an option to increase map font size wouldn't really help (except the map, obviously). This is more of a system issue. Have you tried fiddling with the compatibility settings for the SkyDemon app (in Windows) to see if there's anything there?

I am not sure if this latest version (3.6.0) including a new option to change the mapping text font size on PC is partly as a result of feedback like mine, but I want to thank you for it anyway. It came as a pleasant surprise.
It is a definite improvement. Kudos to you, sir.

I suspect the problem you posted about is slightly different, but I'm very glad the new text size feature helped anyway.