[Lizmap] Selection tool not avaible

[COSTA Laura (Technicienne SIG) - DDTM 06/SAT/PCEP]

Hello,
I've seen on the demo project a very nice selection tool.
But on my installation I don't see the button, there are not any options 
on lizmap plugin on QGIS, and i don't see any documentation on this tool.
How can i implement it ?
I'm running Lizmap web client 3.4.1 and QGIS server 3.16

Thanks
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