Not exactly what rectangle you're referring to (the grey one on the right?), but there is no 'by-percent' option in Muse. For full-width, you need to drag the rectangle to each edge of the breakpoint and it should then display as '100%' and under the responsive sizing options will display as 'stretch to browser width'.
mohamedh42349860 It's a nice template, but still doesn't clarify exactly what you want to achieve? A single rectangle can span the entire width of a page using the 'stretch to browser width' responsive sizing option. Similarly, using a 3rd party widget you can have a 'hero image' display full-screen (100% width and height) before scrolling down the page.
Otherwise, there is no way in Muse to set a specific width by percentage. You can arrange rectangles side by side and use pinning to control their position as much as possible, but that's it.
Hello people, I tried to make this rectangle is full width but I don't know where option make width by precent:
there is no such thing as 100% width by percent... the correct way is to 'stretch to browser width'
Thank you for your reply, I know about stretch to browser width but the problem that there are two rectangle each rectangle width must be 50% not 100%
so make one large object "stretch to browser width' then place two objects inside it
another workaround is to place two objects (as a group is best) side by side as responsive width and just set the page to keep growing