Looks like your system is configured with the UHD 730 as the Primary Display Adapter. The B580 should be the Primary Display Adapter (Far more powerful) & your monitor should be connected to it, not the UHD 730.
00:57:53.520: [obs-browser]: Blacklisted device detected, disabling browser source hardware acceleration.
00:57:53.394: Initializing D3D11...
00:57:53.394: Available Video Adapters:
00:57:53.395: Adapter 0: Intel(R) UHD Graphics 730
00:57:53.395: Dedicated VRAM: 134217728 (0.1 GiB)
00:57:53.395: Shared VRAM: 17058224128 (15.9 GiB)
00:57:53.395: PCI ID: 8086:4682
00:57:53.395: HAGS Status: Disabled (Default: No, Driver status: Unsupported)
00:57:53.395: Driver Version: 32.0.101.6129
00:57:53.396: output 0:
00:57:53.396: name=PHL 246E7
00:57:53.396: pos={0, 0}
00:57:53.396: size={1920, 1080}
00:57:53.396: attached=true
00:57:53.396: refresh=60
00:57:53.396: bits_per_color=8
00:57:53.396: space=RGB_FULL_G22_NONE_P709
00:57:53.396: primaries=[r=(0.663086, 0.314453), g=(0.284180, 0.639648), b=(0.154297, 0.065430), wp=(0.313477, 0.329102)]
00:57:53.396: relative_gamut_area=[709=1.159359, P3=0.854646, 2020=0.613151]
00:57:53.396: sdr_white_nits=80
00:57:53.396: nit_range=[min=0.500000, max=270.000000, max_full_frame=270.000000]
00:57:53.396: dpi=96 (100%)
00:57:53.396: id=\\?\DISPLAY#PHLC107#7&2a206d99&4&UID41015#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}
00:57:53.396: alt_id=\\.\DISPLAY1
00:57:53.396: Adapter 1: Intel(R) Arc(TM) B580 Graphics
00:57:53.396: Dedicated VRAM: 12704546816 (11.8 GiB)
00:57:53.396: Shared VRAM: 17058224128 (15.9 GiB)
00:57:53.396: PCI ID: 8086:e20b
00:57:53.396: HAGS Status: Enabled (Default: No, Driver status: Supported)
00:57:53.396: Driver Version: 32.0.101.6793
00:57:53.397: Loading up D3D11 on adapter Intel(R) UHD Graphics 730 (0)
00:57:53.421: D3D11 loaded successfully, feature level used: b000
00:57:53.421: DXGI increase maximum frame latency success
