Hello and welcome to the Community, saeed-frontline-

We agree that dark mode would be a great feature to have in all of our products, and we recommend submitting feedback through QuickBooks Idea Exchange so that this can be considered by our UK Product team. 

In the meantime, if the page is causing discomfort, you may consider adjusting the brightness of your screen on your device settings. 

I've just created the product request for this, as suggested by GeorgiaC in response to my question. You can vote for it here.