I followed the lead pointed to by @Fenevadkan and installed one service (opkg update; opkg install luci-app-samba), and as if by magic, the Services menu appeared with “Network Shares” as a service. I looked further into it by inquiring on how to add DDNS to OpenWrt and found this link “https://openwrt.org/docs/guide-user/services/ddns/client” which explains all.
It appears that the Turris team, or possibly OpenWRT have decided to only create and populate the Service Menu with services that you want to install. No services - no menu. That would save space, and reduce complexity overall. A good idea.
I am now off to see if I an configure DDNS.
Thanks all for your input… Tom.