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Mine doesn't have a 3D button in Chrome or Safari.
You can use Google Earth, which does have a 3D mode:
https://earth.google.com/web/@51.50820946,-0.14384172,48.61398534a,1586.27490018d,35y,23.80561685h,59.91505026t,0rThere was a time when Maps had an embedded "Earth" mode. Not sure if they folded it in or abandoned it.
If you have a Mac or iPhone, Apple Maps has really good 3D imagery (and zero other merits).
So it's just me? That is annoying. It's been like this a few weeks, computer has been switched off and on again etc. Don't know how to fix it.