Based on discussion https://wpftoolkit.codeplex.com/discussions/660755
Users says : " if I dock the floating window via the top-central icon, and then float it again, docking it again via the top icon will now have the window at a different size."
Comments: ** Comment from web user: BoucherS **
Users says : " if I dock the floating window via the top-central icon, and then float it again, docking it again via the top icon will now have the window at a different size."
Comments: ** Comment from web user: BoucherS **
Looks like a "Star" is set, not an "Auto".