I actually reached out and talked to the Product Manager of Connect and he cascaded to the Development leadership as I could not figure out an elegant way to achieve what you needed.
Currently there is only one way to get to what you need. So in the folder’s setup, for the field ALL ENTRIES you can do the following:
Type:term AND parent:49bdd66e-7393-4dd6-8089-57c56da8952e
Where that parent value stands for the XID (id of the folder). you can find it out either in excel export of your Glossary or in URL of your browser.
If you would like to propose a more sophisticated, out-of-the-box solution, change in backend of Connect is needed.
The PM of Connect and I agreed that the best way to request this is through:
Please make sure that you tag VojtechT for visibility (Vojtech Talasek is Connect’s PM).