Obi Rope problems in 2019.2.8

[yulaw2k]

Make sure there aren't any compilation errors.

Any compilation error will prevent Unity from compiling all editor scripts, and buttons will be missing or non-functional, etc.

Make sure Obi is correctly installed.

If in doubt, remove the /Obi folder and reimport.

Make sure you don't have any open inspectors in debug mode.

In debug mode, Unity does not render scene view windows (for a reason). Since both the curve and the particle editor are windows, they won't be shown.
Instead of "fishing" for a debug inspector, you can alternatively reset your window layout.

Are you saying it works for you in the latest version of Unity?

I tried it in an empty new project with only Obi, I cannot click on any curve points. They are visible, and edit curve, I cannot see the points to manipulate the curve in that mode.