pages tabs overlap

I'm having an issue with I am no good at the technical side of things, so if you have any answers please walk me through how to solve this! I'm having students each create a page within an exhibit, and the tabs at the top of the exhibit have gone on to a second line - however, they are overlapping. I can still read the tabs and click on them but it looks ugly and I would like to resolve this issue. See here:

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