Preamble
Bitcoin-qt 0.16.1
In the GUI menue under Help->Debug window->Remote Peers the remote peers are listed.
In the "Node/Service" column, the remote peer IP or .onion address and TCP port are listed.
Current situation
Currently, the information about the direction of the connection to/from that remote peer can only be seen when clicking on the according peer row in the table. Then, on the right is displayed "Direction: incoming" (or "outgoing").
Suggestion for enhancement
To see the direction quick and easily for all remote peers at once, and so have a quick comfortable overview on the connections situation, I would suggest the following enhancement:
Left to the remote peer IP or .onion address (in the same "Node/Service" column),
display an upwards arrow ↑ for outgoing connections,
or a downwards arrow ↓ for incoming connections.
E.g. ↑ 10.20.30.40:8333 for outgoing connection to IP 10.20.30.40 on TCP port 8333,
or ↓ 10.20.30.40:13149 for incoming connection from 10.20.30.40:13149
or alternatively Add a new column, which shows the direction (either graphical symbols like arrows, or words like "incoming" or "outgoing")