Comment 6 for bug 1801655

Well in fact things are a litlle bit complicated that users might expect.
Like said into this bug: #1777250 Change of workflow in Import dialog
HomeBanks use a standard pre-coded GtkAssistant, as so have not full control about what is displayed.

What I can do is as you suggest:
=> not display the back button at the end, in the confirmation screen
In Linux, the position is cancel/prev/next and apply
In windows those into your capture, we cannot change this like in the past with gtk-alternative-button-order = 1, has it has no effect

that said, after that the button position under windows are... discussable.
if you look at the windows world:
https://www.google.com/search?client=firefox-b-d&biw=1348&bih=921&tbm=isch&sa=1&ei=tGl6XI3ZOtma1fAPm_q0iAM&q=windows+back+next+canxel&oq=windows+back+next+canxel&gs_l=img.3...7919.11415..11613...0.0..0.70.762.16......0....1..gws-wiz-img.......0j0i30j0i19j0i30i19j0i8i30i19.DMRHlhQroC8

it would deserve to fill in a bug at GTK+ project