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I need simple, basic instructions
There was a popup when I first installed the extension, but I can find any option to view it again. In fact, I can't find any options at all. I lost all my saved tabs from one tab because I closed that window thinking they would stay in the sidebar, but they didn't. The videos are unhelpful, just a lot of clicking but they don't tell you what they are doing, just a lot of clicking around. Where can I read about how this works?
Customer support service by UserEcho
Was it the help menu that you saw? It appears the first time you open TO, but beside the button to hide it, there is a tick box that is selected by default to "not show on open".
In your Tabs Outliner window, move your mouse toward the bottom until the tool items show themselves - click the ? to the right of the tool icons. Is that what you were looking for?