Test Suite Explorer doesn't show up again

After the Test Suite Explorer disappears, clicking View > view Test Suite Explorer still doesn’t come out.
I am currently using 2.0b2.
How can i solve this problem?

Please see the Question 16 and solution in our F.A.Q.

If you want to install the current development version (2.0b3.dev1), I have removed the close button from the Test Suite explorer, in an effort to minimize that bug.

Thank you. I followed the guide you gave me, and now I can see the navigation window well.
Additionally, is the command below correct to install 2.0b3? I can’t do it
pip install robotframework-ride==2.0b3

The development version is not at PyPi repository. You have to install from the GitHub project, like we have in the README.adoc (<> Code tab) page.

pip install -U https://github.com/robotframework/RIDE/archive/master.zip