This should hide the create market button on the markets page when you aren't logged into an account. The bar that tallies up the number of markets should flow to the left to fill the void left by the hidden button.
Coverage remained the same at 62.935% when pulling a8e55909af2fb4c57a3e8be526a1c979d9e33670 on 522-DisableCreateMarket into dfa52f6fe5a04a38cf2a922b810bca61cf920fe8 on master.
This should hide the create market button on the markets page when you aren't logged into an account. The bar that tallies up the number of markets should flow to the left to fill the void left by the hidden button.