Hello @acj,
that is what I feared: it is a Pydio 8 question.
As explained many times in the forum, last time by @charles here [1], we do not support anymore the community version of P8: it is now 3 years that we switched to Cells (and to be honest, I am not an expert in Pydio 8, that is older than me 
), so I don’t even know if this option has been implemented in the PHP version.
The only thing I can tell is that this option is there in Cells Home, at least in version 4+.
[1] Is it there a newest Community Distribution, over the 8.2.5 (2020-01-07) - #2 by charles