I fell into the desk job crap eating mode. I would skip breakfast and late morning eat salted crisps then I'd skip lunch ... dinner would be over portioned though.
Meal prep is a must, getting into that routine and the routine of eating from not easting isn't easy but totally doable; I've done it so I guess I can say that lol. You could prep a couple days worth of salads in air tight ford boxes and also prep some meals you can easily take out the freezer in the morning, zap when home?
I would consider eating clean and add more good fats and protein to your diet instead of sugar snacks that will trigger craving just crap or if you feel you would adapt and be more disciplined with a plan to follow Slimming world.
Swap pretzels for a small helping of nuts, almonds is good.
Add greens to your breakfast like asparagus, kale & spinach
PB should be natural, also almond butter is good... lovely with apples like you have or rice cakes
Make your own truffles with raw ingredients
Total yogurt is good fat unlike mullers etc, add honey to sweeten or defrost frozen berries if you are under eating I wouldn't have the 0% fat option, both are nice
Berries for snacking is an amazing choice
Avocados are good fats nice with eggs, tomatoes & spinach (with or without some ham/bacon)
Meal plan and prep is the biggest key!
Not sure if any of that helps but hopefully some of it does. I took advise through my journey and broke it up over time to what suited me