Curve Disappear

curve dont show up in the curve editor in a single try. The float curve on my timeline disapeared and i cant add point anymore as u can see in the screenshot i have no option for adding point.
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I was able to get into the same situation as you have here. However, I have a yellow triangle at the top left that I can click on. Once I click on it, the toolbar tab shows up and click on the toolbar and drag it so that the curve panel shows up again.