Add the code below to Custom CSS field on your Pricing Table widget’s Appearance tab:
.eapps-pricing-table-column-button{
border-radius: 20px !important;
}
You’re welcome to change the value in the code until you like the result.
Are there any options to alter the shape of the toggle buttons like we can for the column buttons?
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Sure! I’ve added a CSS code for toggle buttons, feel free to check it here: Change toggle buttons form 
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