Here is mine…
By the way, these are the options my adaptor offers. When I want to go back to ‘full-fat’ network speed I change this back to ‘Auto Negotiation’.
IMPORTANT
For anyone wanting to try this you need to note that when you apply this setting it will disconnect your network connection for a second or two before automatically reconnecting at the new speed. This could be important if you’re already doing a download (for example) as it will interrupt that activity albeit briefly.