A Healthy Recovery Partition in Disk Management may be active and important even if it has no drive letter. Do not remove it until you confirm whether Windows uses it.

Step 1. Select the Healthy Recovery Partition that you have confirmed is unused.

Step 2. Choose Delete and check the disk number, partition size, and position.

Step 3. When the data-loss warning appears, confirm only if the target is correct and files are backed up.
Step 4. Use the unallocated space to extend a neighboring partition or create a new volume.
A healthy recovery partition should usually stay. Remove it only when it is unused, duplicated, or no longer needed after backup.