Can't put the in fullscreen mode

[Meraki_h4ashes]

I can't put the screen in fullscreen or even change the resolution in windowed... Since the update.. it's awfull to play, and if i put the game in 4k, the is lagging, please do something

[Lumbering_Troll]

It will not go into fullscreen for me either all of a sudden, every time I try, it just minimizes then goes to windowed. 

[Methanoid]

it should work tbh, if not, try forcing it with an AutoHotkey script and ofc warframe should be using borderless fullscreen. AHK @ https://www.autohotkey.com/

Copy/paste/save the script below and save as whatever.ahk, after installing AHK you can double click the script to run it, then try pressing LALT + N when you have warframe active, it should fullscreen it provided the screen dimensions are being reported correctly, i see you have 2 monitors, is 1 of them possibly a different size to the other?  maybe warframe is "fullscreening" using the other displays different size or something else weird?..   * shrug *  if the script still doesnt fullscreen, replace the A_ScreenHeight and A_ScreenWidth with the actual numerical size of your monitors width/height and save/reload the script.
 

Quote

; Bigorize fullscreen window mode games that arent playing ball...
#InstallKeybdHook
CoordMode, Mouse, Relative
SendMode Input
DetectHiddenWindows, On

!n::
SetTitleMatchMode, 1
WinGetActiveTitle, WXTitle
WinWait %WXTitle%
WinWaitActive %WXTitle%,,1
WinSetTitle, BORDERLESSFULLSCREEN
WinSet, Style, +0x80880000
WinSet, Style, -0xC00000
WinSet, Style, -0x400000
WinSet, Style, -0x40000
WinSet, Style, -0x800000
WinSet, Style, -0x80000
WinMove, BORDERLESSFULLSCREEN,,0,0,A_ScreenWidth,A_ScreenHeight
WinShow
return

Edited June 30, 2019 by Methanoid