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When opening eclipse for the second time and on. I start missing the tab package explorer and also the WindowBuilder. And I can click it with open with WindowBuilder because it doesn't give me the option. Also the tabs "Source and Design" disappears under the code. How do I solve this

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Try resetting the interface (called 'perspective' in Eclipse) by right-clicking the Java button in the top right corner:
enter image description here

Alternative: choose Window > Perspective > Reset Perspective...

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