"Update Thumbnail and Snapshots" not functioning

Hello, sorry for the triviality of my questions but what can be the reason why “Update Thumbnail and Snapshots” cannot actually update any of the Manipulate panels that I have in my demonstration ? Please find it attached.
My second question is how to deal with the fact that the length of control value increases, increasing the size of the Manipulate panel ? The explanation in the Wolfram guidelines are not too detailed.
Thank you very much,

Best regards,
Nicolas Murer

ImpedanceOfReactionECAtARotatingDiskElectrode2.nb (245 KB)

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