Hi Henry,
Thank you for using Syncfusion products.
Query #1: Is there a way to force all all float windows to spawn in the middle of the screen?
Yes, we can position the float window by Rect coordinates using the attached property “FloatingWindowRect” in DockingManager. We have prepared a sample for positioning the float window in centre of primary screen, similarly you can position it in your screen as per your requirement.
Query #2: Is there a way to disable the "double click to put control into float" feature?
Yes, we can disable this feature in Document tabs by setting the property EnableDocumentToFloatOnDoubleClick=false. This property is available from our 13.1.0.21 version.
Sample:
DockingManager_FloatWindow.zipPlease let us know if you need further assistance on this.
Regards,
Jessie