3 dot menu is deprecated in android... search on the market an app to enable menu and configure titanium... than you are done.
Alternative, use a button mapper to assign menu to a button (as I do).. for menu action you need to be rooted.
Wait, what? The hardware menu button is deprecated. The S4 is one of the last phones to have one. See https://developer.android.com/guide/topics/ui/menus.html
For devices with no menu button, Titanium uses the 3 dot button to access settings. On the S4, either Titanium or the framework detects that there is a hardware button and Titanium doesn't show the three dot button. There used to be a functionality in CynaogenMod 13.0 that told apps there was no hardware menu button if the button was reassigned. For some reason, that code never made it to Lineage 14.1 or AOSP.
@ifek: You will need to use the hardware button, you cannot assign it to something else. I generally use it as recent app switcher on single press, and menu button on long press.
Edit: I just checked, and Titanium doesn't actually use the 3 dot overflow, it just shows a button labeled MENU in the top action bar. Still, it only does that if there is no hw button.