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If you enter a plan with users already present then there is another Add user button under the user's listslist of added users.
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After you click it the same modal that allows you to search for users will show up.
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After you finish working with the plan, make sure to save the changes. At If there are any unsaved changes, you will see a notification ‘unsaved changes’ at the top of the page, next to the Plan’s name you will see a notification whether there are any unsaved changes.
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If you see the label , simply just click Save Plan and all changes will be saved. You will also be notified that the changes are not saved in a pop-up when you try to exit the page.
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