@davem yes, enable it here: opera://flags/#sidebar-site-panel and you can add up to 5

Best posts made by subzero111
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Latest posts made by subzero111
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RE: ✓[Solved]How to add sites to sidebar?Opera GX
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Pre-load sidebarSuggestions and feature requests
It would be great if we could selectively choose to preload certain sidebar tabs. This is for both Opera and GX.