Training area - Gem guide can't be completed on 2560x1080 (21:9)

The gem guide highlights the wrong areas on the screen and blocks any click outside it

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Can’t go past this since the Synthesize Gems button doesn’t have a hot key
I’m playing at 2560x1080 (21:9), changing to 1920x1080 does fix this, but it may not be intuitive

Had this same problem but in lower resolution. Fixed it by changing the borderless to fullscreen on the “Settings → Video → Screen”.

Regards Murray