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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?
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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?