[RMMV] NEED HELP: DISPLAYING DIALOGUE BOX BELOW MAIN SCREEN

hi! i'm working on a game with a 'box' concept, and i need help trying to figure out how/if its possible to display the dialogue 'below' the main screen where the map is displayed. i would be delighted if there are any existing plugins to this, but if anyone can point me to where i should work in the javascript of rpg maker mv i will do my best to learn (im a little familiar with coding but not js yet, i do intend to learn now that im using mv and it requires it)

for image examples, i currently have the prototype main 'box' set up this way, i intend to have a 'frame' around the screen at most if not all times to give it a story/fairy tale theme:
(link: https://imgur.com/Nkua1Mw )

current main screen, with golden 'frame' (map still being adjusted), top and grey bars at the bottom are the screenshot crop, the title bar and end of the screen respectively). window size 816x624
(link: https://imgur.com/6bxqYJj )

current display of the dialogue box, notice that it overlaps the bottom of the screen as its centered on the map (working on text sizing bugs)

the desired effect im going for is something like this:
(link: https://imgur.com/d5Wx2Vm )
is it possible? is anyone aware of how could i do this? i would imagine i might need to drastically alter something in the code wrt to map rendering, ive done a quick test to look at the parallax display (this map is currently 9x9) and the parallax renders on the whole background as desired. i believe perhaps so the screen isnt weirdly off center when dialogue isnt on display, i could probably have a menu there, similarly to old point and click games that had a bottom bar always on display. any thoughts appreciated, as i have no idea where to start with this