Hi ZivaWernick
"shrink and merge without losing anything" - cannot be guaranteed. things can go wrong, full image backups are essential before attempting any changes to the partitions. (use a third party solution for image backups)
The windows disk management is very limited and will only allow to extend partitions into unallocated space to the right. To move and extend partitions you will need a third party solution such as AOMEI partition assistant
(other solutions are available)
the first two partitions are required (the 499MB recovery and the 100MB EFI)
what is it you want to do?
do you want to take space from C: to give to D:?
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 it.