I've largely cut seed oils out of my diet for about 2 years now, but I still get surprised sometimes.
100% of frozen/processed foods have them (no surprise there) - so just avoid those by default.
99% of restaurants cook with canola oil or use soybean oil for their sauces, even "healthy" establishments (especially gluten-free/vegan) are almost guaranteed to have them because they have to compensate for the higher costs of ingredients and poor taste.
99% of bread, cereal, bagels, chips are made with canola oil - more reason to avoid carbs in general.
Recently I bought 3 packages of of corn taco shells, which are generally made with palm oil (which is okay to eat), but lo and behold, they were made with canola oil. In the trash they go. Bought some canned calarami and sardines too, and god forbid they use olive oil like any sane person would think - nope they used canola oil too. In the trash they go too.
Canola oil is even in things like seasoning mixes and oat milk! I was on a trip and my friends went to get groceries and they brought back what they thought was "healthy" cereal and "healthy" milk alternative, both had canola oil as the 2nd ingredient, what a joke. The only cereal I ever eat is grape nuts (which have 4 ingredients, wheat/barley flour, salt, yeast) and everyone I've told either hasn't heard of them (despite them being around 100 years) or thinks I'm a weird. Meanwhile they eat their "healthy" marketed clown cereal with added sugar and canola oil + plant milks with canola oil and sugar.
God forbid you live in a small town - you'll be lucky to find a single restaurant or supermarket that doesn't use canola/soybean oil. Only alternative is to do hunting/fishing or go to a butcher, but have fun eating that and nothing else other than fruits/veggies. It's no wonder everyone in small towns are inflammed, pudgy, diabetic, or straight up obese.
It's absolute insanity - not even getting into the refined carbs/sugar that are also a part of all these ingredients. Canola and soybean oil are literally in EVERYTHING.
Guys, please read your food labels even if you are certain. You have no idea how pervasive this is, I am convinced it's due to lobbying, ignorance, arrogance, and most likely may even be intentional to weaken society and make people more reliant on the the medical industry (plus it's cheaper than other oils, but that's probably just a bonus). Say what you will about Europe but the prevelance of seed oils there is considerably lower.