Usually, the EFI System Partition (ESP) and the boot partition are on the same disk, but if your computer has more than one internal disk, then the EFI system partition and the boot partition may be separated on different disks. In such case, you may want to move the EFI System Partition (ESP) to the disk which the boot partition is on. Here you can find the solution about how to move the EFI System Partition (ESP) to another drive.
Step 1. Run EasyUEFI as administrator, then click the 'Manage EFI System Partition' button.
Step 2. Click the 'Move EFI System Partition' button.
Step 3. Select the EFI System Partition (ESP) you want to move in the first disk/partition list, then select the destination partition in the second disk/partition list, the selected partitions will be marked as red.
Step 4. Click the "Move" button to move the partition.