It might have been helpful to post screenshots of your existing disk's partition layout and how Reflect adjusted the destination disk's staged layout after clicking those buttons, but basically, if the partition you wanted to shrink in order to make everything fit onto the larger disk was NOT the last partition on the disk, then you have to drag the source partitions down to target one at a time, working left to right, and when you get to the partition you want to shrink on the destination, adjust its properties as desired before dragging down subsequent partitions.

The free version of Reflect can perform this type of clone operation as well, minus the ability to use Rapid Delta Clone, but that doesn't work in partition shrink scenarios anyway. Think about that, something that I got for free works and does what it's suppose to and a software application I paid over $100 to purchase doesn't have the same capability. I'm currently using a free cloning application to install my new SSD. It works great for imaging but it's about as intuitive as a bag of rocks when using the cloning function. Stop trying to make things unnecessarily complicated and fix your software. Especially when I paid for the 4 pack of this software. If I clicked on 'Minimum size' it showed 43GB partition size and the rest unformated raw space. However it didn't do this, It showed less than a few MB used. I clicked maximum size and what it should have done is show an almost 500GB partition with 43 GB used. There were around 43 GB used on the 1 TB drive and I was going to a new 500 GB SSD. I tried clicking on 'Maximum size' and it just didn't work correctly. Most cloning software will adjust the partitions automatically and 'sense' that you are cloning from a larger drive to a smaller one. I tried cloning from a larger disk to a smaller SSD today with Macrium.

Macrium clone disk