You seem to be using the Photos app to view the exported image. It is color managed, and should display identically to Lightroom.
My guess is that this is either caused by a buggy GPU driver, or a defective monitor profile.
First try to disable the GPU in Edit > Preferences > Performance. (uncheck Use graphics processor)
If this fixes the issue, update your graphics driver to the latest version, then try to enable the GPU again.
If updating the graphics driver doesn't help, try setting the monitor profile to sRGB.
If this fixes the issue, it is recommended that you calibrate your monitor with a hardware calibrator.
This will also create and install a custom monitor profile, which will be more accurate than sRGB.
With Lightroom closed, press the Windows key + R, type colorcpl in the box and press Enter.
Add the sRGB profile, then set it as default.
