Thanks for reaching out! There is currently no way of changing the text box size in multiple slides, and you also cannot select multiple objects across different slides to change their properties in one go.
As a workaround, you may select individual text boxes and quickly change the dimensions of that object by modifying the Width and Height fields, as shown in the screenshot below.
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Hi Daniel,
Thanks for reaching out! There is currently no way of changing the text box size in multiple slides, and you also cannot select multiple objects across different slides to change their properties in one go.
As a workaround, you may select individual text boxes and quickly change the dimensions of that object by modifying the Width and Height fields, as shown in the screenshot below.
I appreciate your patience!