The playback markers shown in the picture allow playback and recording only for less than 0,2 seconds. The location of the markers does not affect the situation (the blue one always follows the yellow one and I can not expand the range between them).

I tried to remove the blue one but found no tool for that. The problem appears both in my own projects and in existing demo songs.

I even uninstalled my MusicStudio and reinstalled it; same thing happened. Then I installed the trial version of Samplitude Music Studio, and found the same problem there.

I'm relatively new in working with studio software, so it is difficult to know, whether this is about something very simple, or very complicated.