I have a recent Mac with two partitions. The first one contains MacOS, and is encrypted with FileVault. The second one contained a Bootcamp Windows installation. Here is a screen shot:
I deleted the Bootcamp partition to reclaim space. Turns out: as a FileVault partition can't be resized, it can not grow to use the extra space.
What must I do to have one big partition again?
Best Answer
As @alan-shutko pointed out with a hyperlink, the only way to resize a encrypted partition is to disable encryption, (rebooting again,) then changing the size. It worked for me!
It's a lengthy process if you wait for it, but bearable if you let the decryption happen overnight.