A verb in The Etymologies of the 1930s appearing in its (Noldorin) infinitive form panno “to open, enlarge” under the root ᴹ√PAT (Ety/PAT). Given the glosses “to unfurl, spread out, open” for its Quenya cognate ᴹQ. panta-, I would assume panna- means “enlarge” in the sense “*expand”.

Neo-Sindarin: I currently recommend using ᴺS. panna- as a Neo-Sindarin verb for “arrange; put” inspired by G. panta-. Unfortunately, this conflicts with panna- “open”. In many cases the meaning should be clear from context based on the object of the verb, such as panno i fend “open the door” vs. panno i vegil bo i hardh “put the sword on the table”. Where things are ambiguous, I think the adverb ed “out” can be used to make the sense “open” more clear, as panno ed i golch “open (out) the box” vs. panno i golch v’i tham “put the box in the room” vs. panno ed i golch v’i tham “open (out) the box in the room”. Compare also intrasitive S. edra- “open (out)”.