Dear Ruskin,
You can set the spacing in between the portfolio items from the menu item settings. Please look at this screenshot for more details.
For customizing the images size, you will have to add custom css in the custom css section of Portfolio Manager options.
Please look at this screen for more details:
Add the following CSS rules to this section
.isotope-item {
width: 320px;
height: 230px;
}
.bop-view {
width: 320px;
height: 230px;
}
.bop-view img {
width: 320px;
)
.bop-view .bop-mask, .bop-view .bop-content {
width: 320px;
height: 230px;
}
.bop-view .bop-view-para {
width: 288px;
}
After adding this CSS, you can adjust the spacing using the Menu Item settings explained above.
Please let me know if you have any other queries.