You could try...
Try starting Chrome from the Desktop in with a command switch..
Right Click on the Chrome Icon ShortCut and edit "Properties"
In the target box at the end of ".exe" and one space and --window-size=200,500
--window-size ⊗ Specify the initial window size: --window-size=w,h
Pick the size you want (ex: =600,700 etc.)
Close and start Chrome with this Icon... You should start with the window of that size.
Note: This is just for the initial size of the window only.. also, if you click on "Maximze" (upper right) you must
return it to the "Minimized" size for the start size to be honored. It remembers this setting.