I cannot get boot camp to restart in macOS

I used the Boot Camp Control Panel (which seems to load normally in Windows) to change my startup system to Windows. It worked fine. However, now I can't get it to restart in macOS by selecting it as the Startup Disk, selecting the specific option in the control panel, or restarting while holding the Alt/Option key. Due to its age macOS will no longer update, so I'm running Catalina, but the latest Win 10 on the boot camp partition. Any suggestions will be appreciated.