Samsung Space 32 Compatibility with MacBook Pro 2019

The Mac decides the Name and capabilities of any display you connect by sending a query to which the display must respond or it stays dark.

The réponse is used to set the name of the display in those windows -- I know you did not type it in but there it is, as the name of the window is Displays preferences. And to set the parameters based on what the display says are its capabilities.

Inability to set any resolutions or refresh rates are based on what the display says are it capabilities -- it told the Mac it could do this resolution at this refresh rate. If there are no other choices, the display said it has no more to give (using THIS interface).

I am having the same issue - did the DP adapter solve the problem?

MacBook Pro supports 60 Hz on DisplayPort displays using ThunderBolt-3 or third-party adapters

The Apple USB-C digital AV multipart adapter supports:

3840x2160 at 60Hz on:

iPad Pro 11-inch, iPad Pro 12.9-inch (3rd Generation), MacBook Pro (15-inch, 2017 and later), iMac (Retina 5K, 27-inch, 2017 and later), iMac (Retina 4K, 21.5-inch, 2017 and later), and iMac Pro (2018)

That display appears to have a Mini DisplayPort input.

Your Mac sends a query to the display, and the display answers with its capabilities.

If querying on HDMI shows 60Hz grayed out, that indicates the display is unwilling to run 60 Hz over HDMI.

Try an adapter to Mini DisplayPort, a much more modern, faster, and more trouble-free interface that generally provides faster refresh rates.

Is this the 13-in or the 15-in model?

From where did you get the resolution and refresh rate you are reporting?