Thank you sir, tried that before but could not find it until the third looksie!
Anyone else interested in adding a second continue shopping button the code is in customer/main/cart.tpl line 143 in 4.3.0
Existing code:
{if !$std_checkout_disabled}
<div class="checkout-button">
{include file="customer/buttons/button.tpl" button_title=$lng.lbl_checkout href="cart.php?mode=checkout" additional_button_class="main-button"}
</div>
Change to:
{if !$std_checkout_disabled}
<div class="checkout-button">
{include file="customer/buttons/button.tpl" button_title=$lng.lbl_continue_shopping style="div_button" href="javascript
:history.back()" additional_button_class="flc-1-button"}
<div class="button-separator"></div>
{include file="customer/buttons/button.tpl" button_title=$lng.lbl_checkout href="cart.php?mode=checkout" additional_button_class="main-button"}
</div>