So

Select both text boxes > Add animation > Disappear Both With Previous

Select Text Box 1 Add Animation Appear
Select Text Box 2 Add Animation Disappear

All With Previous

You should have 4 animations in the animation pane now.

Select 3 & 4 (hold down shift) then use the little drop arrow > Effect Options > Timing and set the trigger shape

Now select text1 and add animation Diosappear and Text 2 Add Animation Appear and add a new trigger as before.

Make sure you use the Add Animation Button each time

Hope that helps

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Microsoft PowerPoint MVP 2007-2023
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