The poster session takes place 12:50 - 13:50 on Wednesday, before the main session. There are separate Zoom rooms for individual presenters, and you can visit as many as you like during the session by moving from Zoom room to Zoom room, similarly to a normal poster session.
Links to the Zoom rooms, as well as the posters themselves (and in some cases pre-recorded video presentations), can be found under the presentation materials for the individual contributions in the "Poster Session" timetable entry:
https://conference.ippp.dur.ac.uk/event/891/sessions/1177/#2020091
