Something I have been frustrated with since CS 2019 was introduced is starting to really annoy me now. I have not been able to find how to fix the problems but basically ....
If I draw a rule using the Line tool using 'shift' to restrain the rule to horizontal or vertical does not work, it just floats about at any angle you can think of - I just want to draw a perfect horizontal rule without having to go and edit the position markers!
Then there's the restrain option to enlarge or reduce shapes/images etc - it no longer works!
The most useful option of being able to select any object/text block etc and then use 'opt/command/shift to duplicate inline now just moves the object or text block rather than making a duplicate!

Using CS InDesign 2019 on Mojave 10.14.6

The solution to the problem was sorted out thanks to the Adobe Support Agent 'Darakhshan' via chat.
Seems the problem has been keyboard shortcuts that we're not functioning due to my Anti Virus software - all I had to do was disable Secure Keyboard entries (Webroot SecureAnywhere) and BINGO! Everything is now working perfectly!