Removing free partition on Macbook Macintosh HD Let me tell you the story to understand the problem.
I installed Ubuntu 20.04 on my mac as the second OS. Later I decided to delete it, and being not good in all this stuff, I decided to just remove the 30gb partition I gave for Ubuntu. However, EFI partition was left.
I downloaded Paragon and erased this EFI. But it is not merged still with my Macintosh HD!

So my question is how to merge it (include literally the 314.57 Mb partition) with my hard disk (APFS-container)?
I tried to format it as HFS+ and then tried to make it APSF but my system felt and I had to install macOS again.
P.S. Disk Utility says that there is a trouble and to repair it, I need to go to recovery mode. But when I go to RM, it says the same thing - even though I turned off filevault as some sources say.
I will be very thankful to you for your response!
You a not suppose to remove the EFI partition. This partition was created when macOS was installed. To remove the Ubuntu files from the FA32 formatted volume stored in this partition, take the following steps.

Note: I realize, it is to late for you to follow these steps. I post the steps for others who may have the same question.


Boot to macOS and open a Terminal application window.

Enter the command below to mount the volume stored in the EFI partition. This volume will have the name EFI.
sudo diskutil mount disk0s1


Use the Finder application to remove the EFI/BOOT and EFI/ubuntu folders from the EFI volume.

Enter the command below to unmount the volume stored in the EFI partition.
diskutil unmount disk0s1