shortcut (??) not working in Rstudio 1.2.1335 (Mac Mojave 10.14.5)

The shortcut "??" did not work in my Rstudio, but still worked in base R.
It returns nothing (see the picture below).

It seems that the lastest version 1.2.1335 does not fix this issue on Mac Mojave (10.14.5).
Is there any solution for this issue?

Many thanks!

Accordingly to this github issue, this should be fixed already on the preview version of Rstudio

It works! Sorry I mistaken the main desktop version for the preview version. Thank you so much!

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