Game menu and player inventory

I don't know how it happened. First I went into minecraft, then I went into the world. And so, I want to drag the object in my inventor, I clicked on it, tried to drag it, everything is even. Then I perezashol in minecraft and icons appeared on all the worlds, as if I were simultaneously pointing at all of them (the same with servers). Also, I could not take any items from the creative. I tried to reinstall the launcher, and restart the computer, and reinstall minecraft, nothing helped, and most importantly I don't know how it happened, because it happened only in Minecraft Java, in all other games this was not the case.