I am a long time Opera GX user (from the moment it launched) and love the browser. Haven't had any problems with it for the whole time I've been using GX.
Yesterday for cleanup reasons I completly reinstalled Windows 10 on my PC (formating the drives and reinstalling all programs). Today I found that on the reinstalled Opera GX app I no longer can open new tabs by clicking middle mouse button on empty space in tab bar, it worked fine before reinstall and it now works fine on Firefox and vanilla Opera. Only Opera GX and Microsoft Edge are having this problem, the MMB can close tabs on tab bar but can't open new ones clicick on empty space it also opens new tabs by clicking on links.

How should I go with fixing it?

I am aware that Ctr+T works the same way, but i mainly use mouse while browsing internet and I am used to this feature.
Additionally, when franticly clicking middle mouse button to close many tabs, sometimes after closing a tab it opens new one (just like Ctr+T works), it doesn't work every time and its hard to replicate.

Any suggestions?

I am a long time Opera GX user (from the moment it launched) and love the browser. Haven't had any problems with it for the whole time I've been using GX.
Yesterday for cleanup reasons I completly reinstalled Windows 10 on my PC (formating the drives and reinstalling all programs). Today I found that on the reinstalled Opera GX app I no longer can open new tabs by clicking middle mouse button on empty space in tab bar, it worked fine before reinstall and it now works fine on Firefox and vanilla Opera. Only Opera GX and Microsoft Edge are having this problem, the MMB can close tabs on tab bar but can't open new ones clicick on empty space it also opens new tabs by clicking on links.

How should I go with fixing it?

I am aware that Ctr+T works the same way, but i mainly use mouse while browsing internet and I am used to this feature.
Additionally, when franticly clicking middle mouse button to close many tabs, sometimes after closing a tab it opens new one (just like Ctr+T works), it doesn't work every time and its hard to replicate.

Any suggestions?