Cannot display mobile view on shinyapps.io

Posit Professional & Hosted Products shinyapps.io
, ,
1

Hi,

I'm having a strange issue with launching with shinyapps.io. The web would not display the mobile view on mobile devices.

Here's some senarios to debug:

  1. on local: I use chrome inspect with mobile screen size: displayed properly as mobile view.
  2. published: I use chrome inspect with mobile screen size: does not display as mobile view anymore.
  3. published: resize browser window to mobile size: displayed properly as mobile view

I used "collapsible = TRUE;" in my ui.R, and plotly, and some other html files, and shinytheme.
It seems like the "collapsible = TRUE" is only detecting browser size....not detecting whether I'm on phone or not,

Any idea?
the site is: https://tichx.shinyapps.io/finalproj