I would never want that bar gone (iOS here) but yeah there should be a way to hide it. It should default on for those that have a harder time with tech but at least give the option.
I am curious how 3 dots in the status bar are a “large problem” for you. Seems weird. If it’s getting in the way of your control panel or notifications, swipe further to the side.
Given the position of it and lack of further info, that's looking more like a part of the OS's UI which likely means you can't. Otherwise, look for an options/customise button in your browser's settings.
I'm not very familiar with the OS, but it it's Chrome, it's likely to be more customisable than if it's Safari or the OS. iOS is famously not customisable to the extent alternate OSs are.
To me, it looks like it's part of the titlebar, of the OS. You'll need to lookup if there's a way to remove that from the top bar of the iPad or whatever device you happen to be using - I've never seen it on any of the people I know with an iPad's devices.