It is not possible to place any chairs or couches in a cafe when you are in normal build mode (blue). You have to be in planing mode (yellow), place the things and let them build afterwards.
If you are in building mode, the object is red and is not placeable.
COLLECTED HARDWARE DATA
Application version: Beta 5.0-1
Model: Aspire TC-885 (Acer)
Operating system: Windows 10 (10.0.0) 64bit
RAM size: 8 GB
Battery status: Charging
Battery level: -1
Type: Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
Core count: 6
Frequency: 2 GHz
Type: NVIDIA GeForce GTX 1050 Ti
Memory size: 4 GB
Full screen: True
Resolution: 1920 x 1080 @ 60Hz