How can we configure the width of the search box? Where is it defined in the themes? Is there a CSS selector?

Thank you!
You can find help from Ulauncher documentation to write extension.
@mahmadmujtaba the page you linked to specifically says "You can only change colors in themes. Changing element sizes won鈥檛 be possible due to quirky GTK+ API.". How is this a solution to having a wider search box?
Would be great to know if someone managed to actually have a wider widget.
Yeah me too i gave up after asking this :(
Seems like you can manually edit /usr/share/ulauncher/ui/UlauncherWindow.ui and change width_request from 604 to whatever you want.
Worked enlarging the result box, but the title gets shortened :facepalm:

So I had to edit by hand another file:
sudo nano /usr/share/ulauncher/ui/result_item.ui
<object class="GtkLabel" id="item-name">
<property name="width_request">410</property> <--- changed his to 1000
<property name="visible">True</property>
...
and the description field too:
```xml
<child>
<object class="GtkLabel" id="item-descr">
<property name="width_request">410</property> <--- set to 1000 too
<property name="visible">True</property>
<property name="can_focus">False</property>
<property name="ellipsize">middle</property>
So now it FINALLY looks ok

please consider making title and description expand to fill the available space, and make the search box width configurable
Most helpful comment
Seems like you can manually edit
/usr/share/ulauncher/ui/UlauncherWindow.uiand changewidth_requestfrom 604 to whatever you want.