Let's see... If you reinstalled, my guess is any stored settings are still in the profile folder, which wasn't deleted and gets reused.
Click Edit > Manage Profiles > NEW
and restart.
You can also open the folder:
Edit > Configuration > Profile Directory
Or on page "about:support" there should be a linked button to open it.
If you prefer to have portable profiles, inside the KM program folder, create an empty file "profile.ini" in its root folder and restart.
But KM75.1 is very old. The recommended version is now (unofficial) KM-Goanna 76.2:
http://kmeleonbrowser.org/forum/read.php?19,148500
(sig)
New unofficial K-Meleon 76.4 (KMG76.4) available, in own subforum.
Based on Goanna engine, called 'test' builds forever but more stable as 75.1 acc. forum members. It's 1-2 generations ahead of predecessor KM76RC-2016
K-Meleon FAQ (link missing in forum sidebar)
Tips&Tricks -
Learning new stuff every day
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What do you like? What not?