Worry with Harmony 21

Hello everyone,

I am writing you a message to tell you that these last few days I have a problem with toon boom,

right now I’m a beginners guide in this site The Beginner's Guide to Toon Boom

I got to “How to Animate Frame by Frame” in step 2,

By the time I have to draw one frame after another during each animation,

but without doing it on purpose I pressed somewhere and now by pressing “G”, my drawing no longer turns red, but instead it disappears and when I’m in “Extend Exposure for scene duration” mode it doesn’t matter, the drawing does not act.

What should I do ???