1. change text size
2.click linear show dimension first
3. click annotate
d enter
modify

dimension style manager
modify dimension style
no need right click prepertise anymore
all the font wil be changed. not one by one

if wanna put centre mark into a circle ,
annotate- dimension- centre mark- click on circle

dimension break
change break  size to 20
click dimension break
select dimension
select object

modify
text alignment
iso standard .

supress means delete the lines


extension line
chhoose architecture tick
only chnage extend beyond ticks

offset from origin , to make the dimensions move further away from object

baseline
continue