To change your opening hours, click on your user profile at the top right of the screen. Then click on "All Settings" to access the settings menu.
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Select "Opening Hours".

Here, you can now change the opening hours for the days you are open. By clicking on the green circles, you can open/close your store for a particular day.

You can also access your opening hours at any time by clicking on the opening time displayed in the box for today's sales on the Sales tab.