How to force the text to be uppercase?

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Looking forward for your response.

how to set a response field to convert to capital letters only even if the respondent types in lower case

You can use CSS Code transform all the text to Uppercase

.form-textbox {

    text-transform: uppercase !important;

}

Please follow the instructions on the link below on how to inject CSS Code on your form:

https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

Let us know if you have any other question.

I did that and all form elements now convert to all caps when I fill in the form but the email and google spreaksheets are all in lower case?

The CSS code affects the text while being entered on the form, but it does not affect the text as  it's saved on the submissions, it's not currently possible to force the text to be uppercase, we may open a feature request for this if you want, please let us know.