Thank you for the confirmation. Let's try the steps below first.
You will need to Backup your data as this process may delete data.
Open Disk Management by pressing Win + R, typing diskmgmt.msc, and pressing Enter.
Convert both SSDs to dynamic disks.
Delete the volume on the smaller SSD to free up unallocated space.
Extend the volume on the larger SSD by selecting the unallocated space.
Alternatively, use Storage Spaces:
Go to Control Panel > System and Security > Storage Spaces.
Create a new storage pool with both SSDs.
Choose "Simple (No Resiliency)" to combine the drives without deleting data.
Please let me know if this works for you. I'll do my best to respond as soon as possible.
You may also try this video in regards to storage spaces. https://www.youtube.com/watch?v=K5rkYa7KZUs
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install.