How to adjust the brush so that it does not disappear, what I painted immediately after releasing the mouse?

Question

Adobe After Effects

Hello. I have Adobe After Effects CC 2019 installed. I wanted to paint with a brush on a layer. The problem is that when I select the desired layer and draw a line, this very line is visible, but as soon as I release the left mouse button, this line disappears, when I draw the next one, all previous lines are shown.