Unfortunately, it is not possible by default to expand the options in the relevant tab to the default tab. It is possible to create custom tabs that add subgrid pointing to related tabs. Redundant tabs can be removed from the related navigation in the Classic Forms Designer. I found a similar issue, please refer to the answer. https://powerusers.microsoft.com/t5/Microsoft-Dataverse/Forms-Expand-Related-Tab-by-Default/td-p/928339
Best Regards, Dengliang Li
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