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After the update I have the same problem, this option has been removed from settings and scrolling is Disabled by default but I found a magic solution as a result of my own efforts 
Solution;
Go to this address opera://flags
Search for #scrollable-tab-strip and select Enabled
After the update I have the same problem, this option has been removed from settings and scrolling is Disabled by default but I found a magic solution as a result of my own efforts
Solution;
Go to this address opera://flags
Search for #scrollable-tab-strip and select Enabled