Document how to disable/hide Posit Assistant and the What's New dialog

[gtritchie]

RStudio User Guide additions

Add the following to the RStudio User Guide documentation.

Posit Assistant

For RStudio Desktop you can disable and hide the Posit Assistant features entirely by setting the environment variable RSTUDIO_DISABLE_POSIT_ASSISTANT to any value, e.g. RSTUDIO_DISABLE_POSIT_ASSISTANT=1.

RStudio Server lets you do the same via adding posit-assistant-enabled=0 to /etc/rstudio/rsession.conf. Server also supports the environment-variable approach.

What's New

The "What's New" dialog (Desktop-only) can be suppressed via setting RSTUDIO_DISABLE_WHATS_NEW=1 in the environment.

[gtritchie]

Confirmed this information is in the docs builds:

• https://docs.posit.co/ide/user/2026.05.0/ide/reference/environment-variables.html
• https://docs.posit.co/ide/user/2026.05.0/ide/guide/tools/posit-ai.html#hiding-posit-assistant-features