You show one partition as bitlocker which is Windows only and other as NTFS which probably has fast start up/hibernation flag set on.
You could only open those two partitions if using Windows.
+1 on Dennis N's suggestion of a new gpt partition table. That in effect erases drive.
Then you can partition it anyway you want.
In gparted, select device in top menu and change from default MBR(msdos) to gpt. It should warn you that it will erase drive. Make sure you have selected sda, not your NVMe drive.
I like to label every partition, particularly those I do not normally mount with fstab. Then the auto mount uses the label, not some long UUID where I do not know what partition it really is.
You can set labels with gparted, with disks (gnome disks) or command line.
With gpt there now are two labels, one used by gpt as partition and one by the filesystem which will be used if auto mounted by file browser.
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