You can reset Azure Portal Dashboard to default state. Consider a situation, you modified some of the existing dashboards, and you want to go back to default state. In that case, you can go ahead and reset the dashboard to default Azure dashboard by choosing “Reset to default state” option.
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Reset Azure Portal Dashboard to default state
To reset Azure Portal Dashboard, In edit mode, right click on dashboard and you will have the option for “Reset to default state”
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Selecting on that option would provide a warning dialog. If you really want to reset it to default dashboard state, select Yes.
You will have the dashboard back to default state.