Why make the interface so crowded, so fond of negative optimization

I solved the problem in a strange way, by dragging the top column of the layer and finding that it didn't zoom in or out, then opening zoom and finding that it did, after I clicked on the front slider, it suddenly flashed, and then returned to normal. I tried to restore the abnormal to normal operation, and many times I couldn't, but the little eye icon still needs to be released to disappear. I don't know why it needs to be removed