wherever you drag it, it's there, r/l/t/b (see arrows that appear once you drag a pane)
it takes some time to learn how to do it, cause there are many options how a pane can be attached, it can be on the r/l/t/b of the whole application, r/l/t/b of the certain pane, or when moved to the middle of 4 see-through arrows of the pane, it can be another tab on that pane ...
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