Modify the windows size please with the double arrow indicator

[Contro]

Modify the windows size please with the double arrow indicator

I am going mad when I am nervous (that is in almost any difficult for me situation....)
I would like a very easy and simple way to modify windows and interior separator in the programs (like in Thunderbird) .
Sometimes the double arrows seems resist.
Is it possible to make bigger and more interactive ?
 

[Contro]

 

[cmpm]

You could try this to see if it does what you want it to.
It's for Windows 8 but seems to work in 7 too.
Hitting cancel will restore your defaults.

edit, i see you said 'interior separator'
this only does the exterior border

http://winaero.com/download.php?view.31

[cmpm]

Here is someone with the same question. But no good answer to fix it.

http://help.lockergn...--ftopict260210.html

[Contro]

Useful indeed.
The user seems abandon the post and we don't know about his tempts, but I think there is a good possibility with the sensibility of the mouse pointer and its velocity.

Best Regards