if you change status of data sources, exclusions, etc and the sitemap won't reflect any change, it simply means that it's cached someway. Thus pay attention to disable and clear all caches when you attempt to change things.
Also note, that when in the main data source landing page, there is a button that says Edit Datasource. However, there are no checkboxes to select an item.
Please read, duplicated over and over: https://storejextensions.org/forum/view/10-jsitemap/6033-re-missing-select-option-on-data-sources.html
Please, search through this forum before opening duplicated posts.