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You need to unmount the partition before resizing it. That’s why you can resize the system partition once the system is loaded. As Raspberry Pi OS will automatically mount all partitions, the first step is to right-click on it, and choose “Unmount”:
[[File:Unmount-partition-1.jpg]]
Then, you have access to the Resize/Move option in the menu:
[[File:Resize-partition.jpg]]
You can either move the cursor on the graphical representation to resize the current partition or type the new size in the form. Then click on “Resize/Move” to save your changes.
The last step is to click on the green tick to apply the changes on your disk.
[[File:Save-changes-gparted.jpg]]
Raspberry Pi OS should now automatically mount the partition each time.
'''Create a new partition'''
Once the disk is selected, make sure you have some unallocated space available to create a new partition. If not, you need to resize an existing partition first (or just delete one if you don’t need it anymore).
Then, click on the unallocated space, and choose “New” in the dropdown menu. A form will show up. Make sure to check the values where I added a red arrow:
[[File:New-partition.jpg]]
At least, you need to set the new size (it will use all the space by default), the file system (fat32 for a small partition that you want to read on Windows, ext4 if you’ll only use it on the Raspberry Pi).
You can also choose a label, that will be used in the file explorer.
Once done, click “Add”. You’ll directly see the impact of your changes in the graphic representation. But you need to click on the green check to apply the changes on the disk. It may take a few minutes, depending on the partition size and hardware you use.
Once done, you’ll get a success message like this one:
[[File:New-partition-ok.jpg]]