I didn't know this was doable. I need to watch Mouser's videos more often. 
I didn't know it was doable either! 
- which is why I put up the "tutorial" above, as I figured maybe other CHS users might not know.
I only discovered it by accident, playing about in the CHS main GUI window - I had inadvertently clicked and held a tab
by its label, and I saw this ghostly rectangular image of the tab outline moving around. "That's funny..." I thought, then realised that I was dragging an object (the tab's pane).
A bit more experimentation showed that these Tabs seem to behave as inner panes trapped within the boundaries of the CHS main GUI window, and you can stick them together or to the sides of that window. If you double-click a Tab, it then "floats" as though it is a separate window, but it's behaviour is not that of a normal Windows object. Double-clicking it restores it to it's previous position, but it seems to lose its size settings in so doing. You can make all 3 tabs floating and then make them disappear (by closing them), leaving an empty main CHS GUI window(!) - and I haven't figured out how to get the tabs back - but you can quickly restore normality by selecting a preset Layout from the menu.
This "draggability" and reconfiguring of the tabs in the CHS main GUI window seems not to have been documented (?), or covered in any of the CHS videos by
mouser that I have seen:
See this summary of CHS "How to" videos ("screencasts"): (Have I missed any?)
Spoiler (click to show/hide)
Summary of CHS "How to" videos ("screencasts"):
(Some parts of earlier videos may be obsolete where CHS has been changed since the video was made.)
Videos are summarised here: http://www.donationcoder.com/screencasts/chs/
1. Clipboard Help+Spell : 15 minute video tour - by mouser.
Description: An introductory tour of CHS features.
Duration: 15mins.
DCF comment link: http://www.donationcoder.com/forum/index.php?topic=1514.msg240498#msg240498
Video view link: http://www.donationcoder.com/screencasts/dc/3ds/chs1/chs1.html
Video file download link: http://www.donationcoder.com/screencasts/dc/3ds/chs1/chs1.mp4
2. Clipboard Help+Spell Screencast: Image Clips - by mouser.
Description: An introductory overview of the CHS image capture features.
Duration: 11mins.
DCF comment link:: http://www.donationcoder.com/forum/index.php?topic=26575.msg247106#msg247106
Video view link: http://www.donationcoder.com/screencasts/dc/3ds/chs2/chs2.html
Video file download link: http://www.donationcoder.com/screencasts/dc/3ds/chs2/chs2.mp4
3. CHS Demo Screencast: Using Custom Script/Tool Formatting Presets - by mouser.
Description: An introduction in how to use and configure advanced custom modification presets that invoke external scripts/tools.
Duration: 6mins.
DCF comment link: http://www.donationcoder.com/forum/index.php?topic=28311.msg264788#msg264788
Video view link: http://www.donationcoder.com/screencasts/dc/3ds/chs3/chs3.html
Video file download link: http://www.donationcoder.com/screencasts/dc/3ds/chs3/chs3.mp4
Look, I just dragged each of the 3 tabs into individual vertical panes in the CHS main GUI window. I think this may be even more useful (good ergonomics) to me than the LHS+RHS pane configuration in the "tutorial" objective, above.
Spoiler (click to show/hide)
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