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There is no limit to add team member in a team, i can see you using filterable style grid, please choose “Jquery Pagination” instead of “Pagination”
At bottom of Layout Builder tab, you will see the option for filterable, you can set custom number of post per page for the filterbale grid. please see the screenshot
I understand the issue why newly added team member doesn’t show the list, you will need to click on reset button to refresh the list, i know this silly, but i should update this option,