If the theme contains a sidebar, you can manage it at your own discretion.
The sidebar is managed in the section: "Appearance" - "Widgets".
First, you need to sеlect a specific sidebar from the list:
In the left field, sеlect the desired widget from the list and click the "add" button:
Added widgets appear in the column on the right:
If you click on the widget title, the widget settings will open:
The widget settings also inсlude its deletion.
If there are several widgets, they can be moved either using the "up" and "down" buttons located in the right corner of the widget.