Cannot see all tabs in ttk.Notebook
So I did fix your issue however, I have no idea why tk is doing this. I solved this tab over-lapping by increasing the length of the tab text. I changed this portion of your code:
nb.add(page0, text="long_name1")nb.add(page1, text="long_name2")nb.add(page2, text="long_name3")nb.add(page3, text="long_name4")nb.add(page4, text="long_name5")Once again I don't know why tk does this! Someone that is more experienced with tk could probably tell you why.