Is this really too much food to loose weight on

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I'm sad haha I've recently started a new job which is very sedentary. All previous jobs I've had were very active.

I'm trying to lose some weight but I havnt really lost any in the past 3 weeks. Finding it hard to judge as if I ate like this in previous job weight would be falling off me!

General food is:

Breakfast - 2 weetabix, handful dried fruit and nuts.

Lunch tends to be dinner leftovers and an apple.

Tend to to have a snack on the way home, either an eat natural bar or carrots and hummus.

Dinner - really varies but trying to keep it healthy and I've made healthy 'swaps' I.e veg alongside pasta rather than garlic bread.

This week we've had:
Mon - roast (Defo my worst meal of the week as I had a pretty big portion and obv roasted stuff is not great)
Tues - hairy dieters beef, sausage and red wine 'pie'
Wed - stuffed pasta in tomato sauce with veg
Thurs - veggie burgers with salad and sweet potato fries (no bun)
Fri - veggie sausages, potato disks, yorkies and veg.

Sometimes I have a yoghurt after dinner, tends to be a muller corner type though. 3 times at work this week I've had something like an iced donut or a cupcake as I'm in training at the moment and it's been birthdays and our trainer made cakes yesterday (which were incredible so no regret haha!)

Exercise wise I'm struggling. I have horses so I have very limited time outside them and work. I'm averaging about 7000 steps and also ride the horse 6 times a week.

I'm getting up at 6am and getting home at 8.30pm so I could get up at 5 and do some extra exercise I supppse.

Thoughts on what I can change? My partner cooks dinner and she knows I'm trying to diet so she is trying to keep it healthy.

I suppose I could totally cut out the Work treats (I think this will reduce once I finish training as it's a totally different environment and eating at the desk isn't really doable due to the nature of the work), swap afternoon snack to a banana or something and swap muller corner yoghurts to a normal yoghurt which could save 200+ calories a day?

It's hard to judge as I'm used to being able to lose weight just by eating remotely healthy 😂

Work is 40 miles away so Defo not walking lol!!! I ate about 3 times as much when on horse duty 😳😳 well not quantity but calorie wise

I could add in a 20 min walk or so at work at lunch I suppose, we get 45 min so not really long enough to do any 'proper' exercise but I do get a bit bored just sitting there.

Better to do a 20 min brisk walk, than a 45 min slow walk imho (especially in your situation) get your metabolism pumping by moving as fast as you can, but dont eat your walking calories as that is another area people can go wrong, because its easy to overestimate and think we can be naughty because we have been so good going for a walk or excercising. Treat them as a fat burning bonus.