Didn’t really notice people still had this trouble until Tim sent me a screen of his GIMP, which has the toolbox window, the canvas window and the menu window, where as mine is all in one, so here’s just a little tip on how to change from seperate to compact.
Go to Windows & Ttick the “Single-Window mode”
Also, if you watch closely my GIMP is black when the default color is Greyish. Well this Website is dedicated to GIMP Themes that you must download and set to the C:\Program Files\GIMP 2\share\gimp\2.0\themes path. When done, if you have GIMP opened close it and re-open, then go to Edit -> Preferences
When the Preference box opens, click on themes and choose yours.
As you can see, mine is AeroIon – feel free to download & use.