As you may have already noticed that the open tab height(s) is(are) too bulky.
2 Answers
In 2023 Intellij Idea:
If you use new UI, go to "Appearance & Behavior" -> "New UI" and then select "Compact mode" from the right side.
That will make tabs and some other menus look more accurate and compact.
Here is the solution.
What you get after doing this.
Before:
After:
Step 1: First you need to install a plugin called Material theme. Step 2: Change the tab height as desired.
step 1: 1) Go to settings:
2) Click on plugins > browser repositories
3) Search for 'Material Theme UI'
as you can see i have already installed it. After it gets installed you will have to restart intellij.
Step 2: Now, 1) Again Go to settings. 2) Expand Appearance & Behavior > Material, then on the right hand side change the tab height as desired as shown here.
then click on Apply and boom you can see the change.





