Can you change the screen colours so that it is more vivid? Dull grey on white isn't the best thing to read. I like my retinas blasted with lasers!

Hello Accounts-pjcelec😊, Within Quickbooks Online you can change the screen colour to dark using the themes option, if you go to the cog in the top right>themes>dark mode.  Alternatively, you could use a third-party app extension as the trademark  Quickbooks colours are not changeable in the product itself.