This feature is available since v4.45.6.
Adjusting the order of meeting providers
Click on "Settings" > Meetings and select "Set provider position" from the action menu. A popup window will open where you can drag and drop the meeting provider:
Customize default meeting provider
By default, the first entry in the list of meeting locations is preselected. But you can change the default value by clicking on "Set default" in the popup window mentioned before. The meeting provider with the "Default" badge will be pre-selected by default, unless another meeting provider is pre-defined via the booking widget (via the meeting-type parameter).
If now "Zoom" is defined as default, it will look like this: