Because you are listing both fields, your items become 'unique' so can not be merged together with "Merge Uniform Items".
However if you order the fields so that your Properties are first and you then turn on the option for "Show Headline" you can group them by those properties.
For example, in these images the 'Floor' is your 'Properties' and the 'Location' is your 'Property Group Names'.
When the "Show Headline" is off you will see this...
And when it is on you will see this...
Is that what you are trying to do?
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11