@jeder lol as far as i remember DB doesn't allow you to pick a specific seat any further than like "silent area" or "children area" or "with table" and when i see this probably for good reason.
@Johann150 well, EMUs and DMUs were the only PKPIC trains that had this enabled, now they expanded it to some EIC category trains which are made of carriages, they want to expand it to all IC trains in december