No (unless you use the split action bar). From the doc:
- The action buttons in the main action panel may not occupy more than 50% of the strip width. The action buttons on the bottom action panels can use the entire width.
- Screen width in pixels density independent (dp) determines the number of elements that will be placed in the main action panel:
- less than 360 dp = 2 icons
- 360-499 dp = 3 icons
- 500-599 dp = 4 icons
- 600 dp and more = 5 icons
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