cubicweb-squareui #5043069 make the rql bar appear [open]

As a User, I sometimes need to type in a RQL query. Configuring my preferences to always have the RQL above the main content is not the preferred option because it uses valuable screen space and I do not always need it.

Could I click somewhere to turn the search field into a large RQL bar ? Could the search field morph into a large RQL bar when it gets the focus ?

done in<not specified>
closed by<not specified>