Hi@Mark Foden ,
According to my research and testing, I can reproduce your problem, it should be a permission issue, when I use an account with Full Control permission, Set Default Selection option is optional. But when I switch to an account with Edit permissions, Set Default Selection option is not available. So it is recommended that you check the permissions of your account. Change the account permissions to Full Control.
Account with Full Control permission
Account with Edit permission
Thanks,
Yanli Jiang
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