The column designer allows you to create column designs using the https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json schema.
Drag and drop an element into a column and start designing.
Once you are satisfied with the design.
Click publish and all columns will be published with one click.
To add or remove columns click the [+] sign for a menu. You may also click "Project Settings" and pick the required columns.