Click on any object -> right clik in property tab -> show all-> right clik in a property -> add property
Also, the option to add property is not shown until you tick the 'show all' option, is this the intended behavior?
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.18640 (Git)
Build type: Release
Branch: master
Hash: 2251f53eb5af097cbb4b879af89575132660e541
Python version: 3.7.3
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Spanish/Paraguay (es_PY)