Creating your own template is very easy. Navigate to any board (or create a new), and when you are happy with it, hit the "Save as template" from the board menu top-left.

If you want to make changes to that template, you can overwrite it by setting the same name in the "Save as template" dialogue. Choose "Replace" when asked. Renaming or deleting a template can be done from the Workspace -> Templates tab.

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