full screen button is missing in secured embedde power bi reports

[ybd]

when using secure bi embedded iframe via the power bi "Embbed" tab in my power bi report "full screen" icon is missing,

my embedding code is: https://app.powerbi.com/reportEmbed?

unlike when using a non secured reports embedding E.G:  

https://app.powerbi.com/view?

how can i enable the "full screen" button in my iframe secured embeddemnt reports?

[v-chuncz-msft]

@ybd 

You may take a look at the post below.

https://community.powerbi.com/t5/Developer/Possible-to-display-embedded-reports-in-full-screen-mode/...