M2 - How to restrict magento default class is picking bootstrap css in custom theme?

Question

I am using bootstrap for home page cms blocks responsive purpose,

declared in app\design\frontend\zero_theme\theme\Magento_Theme\layout\default_head_blocks.xml

Its affect my PDP image size, description section, relevant products alignment, how to handle this situation?

I need bootstrap for responsive design, but its affect my default magento alignment in custom theme?