How to safely resize LUKS root partition?

I have about 300GiB leftover from my Windows installation that I want to merge with my Linux install. My Linux partition is encrypted with ext4 luks. Anytime I try to resize it with KDE Partition Manager or gparted with a Live USB image, I'm able to decrypt the partition, but it does not let me increase the size of the partition (but it does seem to give me the option to shrink it). Is there a way to increase my LUKS partition without any file loss, or is my only option reinstalling Manjaro?

Does your luks partition reside next to ("after") free space left from Windows? In such a case, you have to move it "to the left" when it's locked, and then try resizing. I'd make a image beforehand. Also you need to study luks wiki.

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