Window does not resize to the custom size. about browsersize.com HOT 2 OPEN

Chrome:
Version 80.0.3987.149 (Official Build) (64-bit)

MBP: 16"
Model Name: MacBook Pro
Model Identifier: MacBookPro16,1
Processor Name: 8-Core Intel Core i9
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 8
L2 Cache (per Core): 256 KB
L3 Cache: 16 MB
Hyper-Threading Technology: Enabled
Memory: 64 GB

AMD Radeon Pro 5500M:

Chipset Model: AMD Radeon Pro 5500M
Type: GPU
Bus: PCIe
PCIe Lane Width: x8
VRAM (Total): 8 GB
Vendor: AMD (0x1002)
Device ID: 0x7340
Revision ID: 0x0040
ROM Revision: 113-D3220E-190
VBIOS Version: 113-D32206U1-019
Option ROM Version: 113-D32206U1-019
EFI Driver Version: 01.01.190
Automatic Graphics Switching: Supported
gMux Version: 5.0.0
Metal: Supported, feature set macOS GPUFamily2 v1
Displays:
Color LCD:
Display Type: Built-In Retina LCD
Resolution: 3072 x 1920 Retina
Framebuffer Depth: 24-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Automatically Adjust Brightness: No
Connection Type: Internal
LG HDR WQHD:
Resolution: 3440 x 1440 (UWQHD - Ultra-Wide Quad HD)
UI Looks like: 3440 x 1440 @ 60 Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
Connection Type: Thunderbolt

Attention: Your current browser settings probably do not allow the resizing of this window, the window is maximized or the target browser size is larger than your desktop size. As a workaround, a new popup window has been opened. If you think that this assumption was in error, please open an issue. [ X ]

^ when attempting to resize my browser. I hope that provides enough information to debug.

from browsersize.com.

The popup don´t reset the browser to the prefered size, you have to do this manually.

Maybe the solution is a button to test the size and other to apply it to the current window.

from browsersize.com.