Install an extension to hide it, I just tried this and it works for me: https://extensions.gnome.org/extension/545/hide-top-bar/
You can install extensions by searching for it in the GNOME extensions manager. Once installed, you can edit the settings in the same place (I found I had to move off the window to another application before hiding was applied).






















I still wouldn’t, because the stock market is already full of algorithmic trading and so you’d have to believe yours was better than the big boys out there.