In version 1.8.1 we have introduced tabs in toolbar, because we are constantly inventing new features and number of icons is getting high. With tabs it is much easier to find a function you need at the moment.
It is especially useful if you define many manual rules and they all show up in toolbar. Not you have more place for them as only 3 to 5 icons are on the first tab by default.
We hope you like it.