Firstly you will need to navigate to Credit Control > Settings and select the Statements template

On the statement template, you will need to remove the Snippet called 'Open Invoices Table' using the backspace or delete key on your keyboard:

What is a Snippet?

Then click on the # button to add an invoices table snippet without invoice links:

Select the snippet 'Open Invoice Table without Links to Invoices':
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Remember to save each template you amend

You may also want to remove a similar Snippet from the Group Reminders template if you have this template also enabled. It is a similar task for Statements which also uses an invoices table that you can replace with 'Grouped Open Invoices Table without Links to Invoices':
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You can remove the View Invoice link from individual reminders too. As this email type doesn't use an invoice table, you can just remove the highlighted line of text using the backspace or delete key on your keyboard: