From what I've understood from my usage of the app, you can (for example) bold text by selecting it and then hitting the "B" button. I think it would be more intuitive and in tune with what is done in most text editors to have it also work as a toggle, i.e. you hit the button to switch in "bold mode", and then the text you write is bolded, and you can hit it again to come back to normal.
Note that maybe it is already supposed to work like that, but then I can't use it at least on my phone, because when I go back to the text area after hitting the "B" button, it becomes un-focused and the text I write is not bolded.
From what I've understood from my usage of the app, you can (for example) bold text by selecting it and then hitting the "B" button. I think it would be more intuitive and in tune with what is done in most text editors to have it also work as a toggle, i.e. you hit the button to switch in "bold mode", and then the text you write is bolded, and you can hit it again to come back to normal. Note that maybe it is already supposed to work like that, but then I can't use it at least on my phone, because when I go back to the text area after hitting the "B" button, it becomes un-focused and the text I write is not bolded.