Yeah, they removed a cr**load of features since they ditched Presto and turned to Chromium/Blink, most likely because they needed to rebuild all these parts from the ground up in order to make them compatible with the new engine. So either Opera ASA turned the removed stuff into standalone programs (Opera Mail, for one), they revamped it (Turbo --> Off-Road) or they completely dumped it. They're
slowly but surely putting some features back in, but only after tailoring it for Blink/Chromium, if possible...and if it
is present on their development roadmap.
End result? Opera is now a bloated, over-minimalistic browser with little of its erstwhile potential for extensive UI/settings customization.
EDIT: Opera Turbo is now called "Off-Road mode".