It depends on your ticket product. At the Competition Complex in Aspire Zone, seating is unreserved for all pitches: both Day Pass and Prime Pass holders are seated on a first-come, first-served basis, so arriving early is recommended for the best choice of seat.
For the Final at Ahmad bin Ali Stadium, seats are assigned and you can select your seat during the purchase process.
LOC Ticketing or the relevant venue authorities may determine and change the seat location for a given ticket at any time, including after purchase and on the day of the match, provided that the new seat is in the same ticket category or in a category with a higher face value. Please note that it is not possible to request a change of seat once allocated.