@flaviu2 those lines are Tab traces, one of our features that allows you to see which tabs were previously opened. You can configure it in settings: opera://settings/?search=Show+traces+on+most+recently+used+tabs
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RE: Strange white lines under tabsTab Islands, Tabs and Workspaces
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RE: How to turn off musicGeneral
@cp1000wolves hi! there is also option in Easy Setup called "Theme sounds" which allows you to quickly disable all theme related music & sounds.