How do I apply a global filter on view tabs?
You can use Global filter which creates filter widgets as blocks based on field or view of your choice and you can use the filter choices in ANY view as contextual filter.

Here is a simple example usage 


For basic page create List (text) - field_choices with widget Select list and values choice1 choice2 choice3


  

Create some basic pages to include 1 of the 3 choices
Create or modify the view and make it display the choice for each result 


  

Add contextual filter with choices as field and provide default value Global filter field


  

Go to Structure &gt; blocks and add Global filter block 1 to a region of you choice and configure it to display choice field as a filter with default widget


  

Visit the view page that has the contextual filter (on choices) and you should be able to filter the view based on the Global filter (choices dropdown widget)


  

You can add the same contextual filter to as many views (or view displays) as you like