Libreoffice's option "Customize" is imcompatble to decrease its Window size in Ubuntu 19.10

If you use ALT you can drag from any point on a window. Is this what you mean?

@andrew-woodhead666 NO, that not I mean.

You did read the entire post along with comments clearly, did you!?

LibreOffice's Customize option's window is unshakable and unusable.

That's the whole point.

See this gif: https://imgur.com/9jcTCAz where I am stuck at Customize window. I cannot drag it down. I cannot press option which can get me out of this window.

Alt + C is just a shortkey I customize to go to LO's "Customize" option window, so that I don't have to go to Tools > Customize manually using cursor.

The gif clarifies the issue. What is the output of:

lsb_release -a; uname -a; apt-cache policy libreoffice

If you make a new user is the behaviour the same?

pranav@exam:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan
pranav@exam:~$ uname -a
Linux exam 5.3.0-45-generic #37-Ubuntu SMP Thu Mar 26 20:41:27 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
pranav@exam:~$ apt-cache policy libreoffice
libreoffice:
  Installed: 1:6.4.2-0ubuntu0.19.10.3
  Candidate: 1:6.4.2-0ubuntu0.19.10.3
  Version table:
 *** 1:6.4.2-0ubuntu0.19.10.3 500
        500 http://ppa.launchpad.net/libreoffice/libreoffice-6-4/ubuntu eoan/main amd64 Packages
        100 /var/lib/dpkg/status
     1:6.3.5-0ubuntu0.19.10.1 500
        500 http://np.archive.ubuntu.com/ubuntu eoan-updates/universe amd64 Packages
     1:6.3.2-0ubuntu2 500
        500 http://np.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
pranav@exam:~$

"If you make a new user is the behaviour the same?"
ans: Don't know. Do u want to do that?

You are using a PPA rather than the official package from the Ubuntu repository. I suggest you contact the PPA maintainer to report the issue. If you use PPAs then results cannot be predicted. You use them at your own risk.

If you run:sudo apt install ppa-purge && sudo ppa-purge ppa:libreoffice/ppa

Then use the LibreOffice from the Ubuntu repositories, is it OK? Why did you add the PPA? What is in the newer version that you need?

pranav@exam:~$ sudo ppa-purge ppa:libreoffice/ppa
Updating packages lists
PPA to be removed: libreoffice ppa
Warning: Could not find package list for PPA: libreoffice ppa

Thanks Manfred :)

Thanks Manfred Hampl, that solved my question.

Again. What is in the new version that you need?